Not sure what to do; please help!

I have been dating this guy for almost a year and a half and I have never questioned whether or not we should be together. But recently, I have been losing feelings for him. The problem is, I have been asking him to change for a year now, and just yesterday, he said that he had thought about what I had been saying and had an epiphany of some sort. However, I still cannot find the same feelings I used to have for him. I feel like life is playing games with me. Last week, I think I may have fallen in love again. I made intense eye contact with someone I know and it left me with a great feeling that gave me butterflies. I just cannot stop thinking about. Today, I saw the first guy I ever loved. I am not really sure what to think of this or if this is some kind of test or a sign? It is all very confusing and I am not sure what to do. It would not be easy to leave my boyfriend because we have been together so long and it seems scary to start over again and impossible to find someone else who would accept me like my boyfriend did. Does anyone have any suggestions? Thank you for reading this!