He broke my heart

I was engaged to a guy about 5 years ago. We were happy and I was so in love with him.. genuinely thought I had found my match. And then it all went to shit and he broke my heart into a million pieces. He’s the only one who has broken my heart actually. We were together about 6 years and it was good. He eventually joined the police and left me for someone else. Anyway, I’m totally over it now. It’s been a few years and I’ve built my life up. Moved away and got a good job and good friends etc. He’s with her now and he got with her about 5 months after we split to make out ‘he never cheated’. Anyway, they also then had a baby together about 6 months later. And this was a shock to me but again I got over it. It was all milestones for me but I always thought it was odd that they weren’t engaged. I was also with someone else shortly afterwards even though it didn’t last because we just weren’t compatible. Anyway, I had this weird feeling tonight and something popped up on Facebook and he has finally proposed to her. And my heart sank. It was tough to see and I have no idea why because it’s been years so why am I bothered after all of this time?? Has anyone else ever had this feeling? If I bumped into him now, I would be fine and I’m glad he’s happy and I would wish him well. I wasn’t bothered when I saw she’d had his kid but seeing that engagement has bothered me tonight. It’s so strange. His mother was also on the post saying ‘finally my boy did good’. It just really got to me.