Any advice?

I need some advice. Please be kind because I’m

Struggling with my mental health.

I was in a 5 year relationship. We broke up earlier this year. I was so devastated and heartbroken. I never felt like this before. He told me he loved me everyday and said he wanted to marry me and promised he would never leave me. But he did.

Over the summer, I was so depressed. I started to miss him and wanted to talk to him. I tried texting him and he would be pretty mean to me.

He would tell me he didn’t want to talk to me and told me to move on.

I just couldn’t understand how he could just leave and hurt me. And that he didn’t miss me or care about me at all anymore ? It just didn’t make sense.

I recently found out that he talked shit about me

To a lot of people and made fun of me for calling him and texting him. A lot of people (and these are grown ass people, like in their 40s) say that I’m his crazy ex that won’t let him go. I’m super embarrassed that he talked about me to people and they think of me like that.

I have been on dates and I’m trying to move on. But he hurt me so badly. I am in my mid 20s and I get so sad that I’m single and wasted 5 years with him.

Any advice ??