How do I stop thinking about him??

We broke up 2 years ago but continued working together at the same place and remained friends. He deserved someone else that could give him the life he wanted. We ended up finding new relationships. Mine ended quite quickly but he was getting more serious with his new girl. I had to watch him constantly text her and hear him say he loved her on the phone. I felt so broken and confused why I felt that way. I told him exactly how I felt and my feelings for him never changed I had just hidden my true feeling so far down. I recently decided to leave work and he helped me so much with my anxiety when I started a new job. He would text me and call me to check I was okay nearly everyday as I would ask if he was okay. I told him I really appreciate everything he's done for me as he didn't need to I could just tell he still loves and cares about me. Our conversations became reminiscing our relationship we had. I thought maybe he wasn't happy with her and missed me. Today he's decided to ignore my messages which isn't him at all. I thought maybe he needs space. I want him happy and it took me a couple of weeks to feel comfortable with him being with someone else I don't know how I would act if he became single again. I know the feelings are still there for me and him. Part of me would give it another chance if the opportunity was there. But I know this isn't fair to think that way. How do I accept the fact that this could be his way of saying I can't be in his life anymore??

This is my biggest fear