guy need advice/thought

My fiance just moved out of the house recently, because she says she doesn't see our relationship going somewhere. I've been a loving and caring man to her for the past 10 years we've been together. She's the girl of my dreams and the only I only want and need in my life to be happy.

We are still seeing each other, because I'm trying to win her back. Whenever she contacts me, I always reply quickly, either by message or phone, but whenever I try to contact her via message or call, she doesn't reply consistently, 50/50. A few years ago, she cheated on me and is still seeing this other guy to this day. And I'm pretty sure that the reasons she doesn't reply consistently like before is because she is with him and she doesn't care that much about me anymore.

When she cheated, she partly blames me for not taking enough care of her, hence why she cheated. I don't understand why it's in part my fault. I told her If she wants to work on our relationship that I'm willing to completely forgive her and forget about it.

I can guess that she moved out to get away from me to try a new relationship with her lover to see if it can work and if it doesn't, she will come back to me. By the way, it happened once before with another guy, but she didn't do anything with him apparently and she came back into my arms.

I don't know what I should do or think anymore. I don't have the guts to do anything, but wish and wait for her to come back to me and fully commit. I've been so patient with her. Sometimes I wish I could kick her to the curb, but I still have this tiny glimmer of hope that she will give up on her damn lover and come back to me and be 100% committed. At the same time, I think it's wishful thinking, because when I tell her to stop contacting him, she refuses and says she still cares about him.

If she is to dump my completely, I will deeply regret to have given up on my friends and social life ever since I have been in a relationship with her, because I've focused and based my entire life on her for the past decade. I am sitting alone in an empty house filled with sadness with no friends to talk to about this.

I asked her for another chance, and she says she will think about it.

Thanks for sharing your thoughts.