<human>: Dated a guy four years ago for almost a year, he met someone else and broke up with me over text because the other Lady was there for him when I couldn't be. He said it was a mistake and he hopes we can make it work in the future. 

Fast forward four years, I'm finally done school and completely independent. I got in touch with my ex to see what he's up to and it was typical small talk and how we should meet up if were ever in each other's area. 

I was hoping we could hang out and maybe it would lead to something more but lo and behold I guess he has a girlfriend and they just bought a house together. 

I guess I missed the boat on that one which really sucks
 I wish I was there for him when we were dating but circumstances that I couldn't control kept us apart. I'm kicking myself for it and I'm super bummed out. He was a cool dude. How do I get over this? I want to tell him how I feel but I know its probably a bad idea.

Can you condense the text into a few key points?
<bot>: ended relationship with ex long time ago, talked about giving it another go in the future. I finally have the chance to pursue, but he just opened a mortgage with another woman. What do?