So, you're thinking about cheating on her, or you've already made your decision and are simply trying to come up with an acceptable justification for it so that if things go wrong, you can explain it wasn't what you truly wanted.
Why are you with her to begin with? Why not just break up with her first if you really want someone else? Why do you feel compelled to betray her?
Allow me to warn you about what will happen if you cheat on her.
You're going to rip her heart out. You'll burn everything she believes she knows about life and love to the ground, leaving her kneeling in the ashes, devastated and distraught. You're not just going to wound her; you're going to break her. You'll leave her with a deep and painful wound that will take years of self-discovery and positive personal development to even begin to heal. Is that what you actually want to do? Is sex with someone else really that important to you that you would do such a thing to another human being, someone you claim to love?
You see, you're not going to merely betray her confidence. For everyone who will ever love her again, you will betray her confidence. Because if someone she loves as much as you, or as much as she believes you love her, can harm her like that, who's to say another person won't? What makes her think she'll ever be able to trust anyone again?
She is unable to sleep. She hasn't eaten in days. She won't be able to smile or laugh freely till it hurts for months. Your betrayal and absence will be on her thoughts every night she sleeps awake. Every meal she takes will be contaminated by memories of eating with you, of what you meant to her, of what you still mean to her, of what you did, and of how she wasn't good enough for you.
But she won't hold it against you because of what you did to her. Instead, she will shift the blame on herself. She'll question why she wasn't good enough for you incessantly and compulsively. She'll compare herself to every other woman she meets, wondering what she could have done differently to salvage her relationship with you.
She'll wonder why she hasn't been able to make you love her as much as she loves you. She'll wonder if she could have done more for you, if she could have paid more attention to you, if she could have loved you more. She'll cry gently when she has a minute to herself, alone with her thoughts, wishing you were still the person she thought you were all along.
Everything you've ever said to her is now meaningless. All of your promises, all of the times you spoke to her as "beautiful," "wonderful," and "amazing" will be a distant memory. She'll stop believing them because you obviously didn't mean it. You wouldn't have cheated on her if you'd meant it when you called her all of those things and flattered her with your words.
It will take her years to accept that when someone tells her that she is beautiful, inspiring, and loved, they are telling her the truth. Because you will not only kill your relationship with her, but you will also destroy her self-worth. You're going to take away her ability to love, trust, and open herself up to another person.
When you love someone, you put yourself in their hands. You let your guard down, allowing them to get close enough to harm you. You give them the ability to ruin you and rip your heart out, and all you have to do now is trust that they love you and would never hurt you. It's difficult to envision ever being that vulnerable again once the person you allowed yourself be vulnerable with turns around and betrays you. What is the point of this? You're only going to be hurt once more. As a result, you close yourself off, erect additional walls and barriers, and distance yourself from people. That is the legacy you will leave if you cheat. That is exactly what is going to happen to her.
So, what makes you think you're going to cheat on her? What are the benefits of betraying the person you're supposed to love?
Why cheat if you don't love her anymore, or if you never did? Why put her through the agony of discovering you weren't who she believed you were? Do the right thing and walk away from her. At the very least, have the courage to tell her you don't want her and break up with her.
If you think you'll get away with it and want to have some fun while staying with her, consider how you'd feel if you found out she'd been cheating on you. Consider how much you truly love her if you're willing to throw everything your partnership stands for in the bus for the chance to sleep with someone else.
Putting that aside, you won't be able to keep it hidden for much longer. Wait till the months pass and she keeps reminding you how much she loves you, how much you mean to her, and how pleased she is to call you hers, no matter how little it bothers you right now. You'll feel a pang of remorse in your stomach. You'll have nightmares about her finding out. You'll wake up in a cold sweat, thinking you could go back in time and undo everything. Is it really what you want?
Why would you throw it all away if you have an amazing woman by your side who loves you with all her heart and would do everything for you? Do you even realize how fortunate you are?
Allow her to go if you don't truly love her. She is significantly more deserving than you are. And if you're seriously considering cheating on her, you don't love her.
That's why many relationships are being broken because of cheating. If you truly loves the person you must be open both.