He moved on in 5 months after 3 years together

We both met when we were 17 and broke up at 20/21. He was my first boyfriend and I was his first gf as well. I heard he’s moved onto someone else. It just feels surreal to me. All those moments shared together has become nothing to him. I still love him so much. I did have issues and he was tired of it and he told me he fell out of love.

I’m not trying to get him back or anything but it just hurts so much to see that he’s moved on. While I’m still grieving over our relationship, he already found someone new.

The thing with me is that I take forever to open up to someone friendship wise, usually takes about a year. Now Imagine for a relationship. it took me so much time to fully open up, to be comfortable enough to become intimate. I completely opened up just for things to end. I did have trust issues and was deeply insecure. That unfortunately led me to act irrationally sometimes like creating arguments when things are fine.

I don’t hold it against him for breaking up with me. I don’t blame him at all. I just want to get over him, to be fine with how things are now. I have no desire of seeing anyone else until I’m the best version of myself. At the same time, I wonder if I’ll ever find anyone else, if I’ll ever get over my insecurities.

I can’t help but think after he got to know everything about me, he didn’t like me. It makes me wonder if anyone else will ever truly love all of me.

I would love to hear other people’s experiences and stories.