I fell for a guy who liked this other girl. Whenever he uses to talk about her, his eyes had a spark. That was never the case when he talked to me. He asked me to get into a relationship with him. I always felt that he wanted to be with me to fill that void. Fast forward two months, got into a relationship and broke off just to realize he wanted to try getting into a relationship with her yet again. You basically put your heart and soul into a relationship and when such things happen, you break down. If you think you can pull this off, it's upto you. Cz that guy later got into a relationship with some other girl and he's really happy. But that was because this time he knew he would never go back to his supposed love. Just be sure whatever you want to do. All the best.