I have a boyfriend but cry about my ex what's wrong with me? What do I do?

I was with my ex for 7 years. He was my first boyfriend. We broke up 1.5 years ago bc of his family. I was over him I thought. I still think about my ex and how this or that circumstance with my boyfriend was so much easier with my ex. I miss my ex and wish it would've worked out some days. My boyfriend has amazing qualities and is better than my ex in so many ways but I think its just hard after being with someone for 7 years. Things with him were easy and comfortable. I love my boyfriend but why do I still cry about my ex and think about him.

I have a boyfriend but cry about my ex what's wrong with me? What do I do?
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