I Believe Long Distance Relationship Can Work

I was talking to this guy online for three years. Recently, I applied for a visit visa but didn’t make it. We just talked today and said he is dating a woman and he doesn’t know when he can visit. Previously he would visit me if I didnt make it. You know, i thought he was as committed as I do. I just don’t get it. I don’t know why men would do this way.