She wanted to apologise in person for the way things ended as she screwed him over. He has always said that he cared about her and he wanted to put bad feelings to rest. When they met up he said that she seemed to have grown up a lot and he was glad to have met up. I felt happy for him to have moved on amicably. They started messaging afterwards from time to time - I happened to notice some of the notifications and began feeling insecure. I told him I felt uncomfortable and he blocked her - I've seen the messages and there was nothing remotely shadely. He even spoke about me and how I'd managed to secure a new place for us and how lucky he was to have me. She wished us both well in our new place and seemed totally genuine.

I think my insecurities stem from not having the same confidence in myself, both personality wise and physically, coupled with what happened long ago. I seem to have some sort of attachment to her as a the source of my insecurity because I see qualities in her that I wish I had.