Why does it feel so weird when your first real love gets married?

We dated for a year and a half, he cheated on me(I mean he kissed a girl at a party, while I was at unwell at his place.)and I stupidly stayed with him until I realized how stupid it is for me to stay, so I broke up with him. We had lots of problems in our relationship, this was about 4 years ago. I knew he was engaged and we had sort of kept in contact as friends I guess you could say, even when his new girlfriend and him were together.

Obviously I knew they were getting married as they were engaged, but we stopped talking and haven't spoken in a long time . And I recently found out he got married. I don't know why, but I cried. I guess thinking it could of been me and then I feel like what if it never is. I have a boyfriend and I don't even know if I want to marry him one day. I don't have feelings for this ex but, it just hit home. I don't understand why? It is also a reminder that I have got nowhere with my life, even when I met him, I'm still stuck in the same place I was before, unwell and going nowhere with my life because of my health. It's depressing. I had dated a guy before my first love but, I consider the one that got married my first, real love. As it was real to me. I don't get why it's affecting me so much?He hurt me and lied to me, so I'd be better off without him. But I can't stop thinking of my past. I
Why does it feel so weird when your first real love gets married?
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