She fell in love then jumped right out

I fucking despise you for what you did to my relationship. But I respect the fuck out of you for being someone cool enough for her to want. More than 5 years of love with this girl. I did everything for her. All of her flaws I embraced with joy. All her emotions I felt by her side. All her issues I held her hand through. I remember like it was yesterday, she wanted to marry me. Maybe even have kids one day. All of a sudden, a switch flipped. She can't see that with me. What did I do wrong? Why am I not enough for her anymore? I accept the reality of being open again. Sure, sounds fun, I like to have a good time. Then she finds you. A few conversations and she starts falling for you. If her love for me is really so weak, why am I still here? Why do I feel sick to my stomach thinking about it? Why do I still feel connected by the heart when she is so desperately pulling away? Do I want to continue this love tug-of-war.. or should I just let go? She needs safety yet craves freedom. She wants love yet craves lust. She wants you and craves you. One thing I know she doesn't want anymore.. me.