Regular poster here, have name changed as this is sensitive.
I have not been able to get over exp of 4 years who I split up with in 2009, despite meeting dp in 2010 and having dd in 2011. I initiated the break up because things weren't right, despite lots of chemistry, he was sexist and emotionally abusive.
Exp went on to get engaged and then married to new gf. I was gutted each time when news got to me, but of course did not let on to dp. This has been a cross I have had to bear, along with the guilt, all this time. I have even had counselling, and have tried to work through these feelings.
I blocked him and her on facebook. Tried not to think of it, but then last night I was looking through old photos and came across a pic of his sister I had removed all pics of him). There was a link to her profile, so I clicked. Scrolled through and inevitably found pics of him and "her". And I felt - well - nothing. No sorrow, no regret, nothing. He is not even as attractive as I remembered. Neither is she, although previously I thought she was stunning and I was insanely jealous of her.
Yes they seem to be very happy. But they are living a life nothing like the one I desire to lead. Once upon a time I would have bent over backwards to have pleased him. I noticed they have relocated. I wonder if that is because of his job that always took precedent over mine (which has taken off quite nicely since we've been apart).
I always saw him as the one that got away. Now I see him as a lucky escape. I genuinely wish them well, which hand on heart, was not something I could have said before
Is it bad that I just wanted to get this out?! I have been racked with guilt all these years about my residual feelings for him, and noone else knows I had them 
[happy]. I feel like a weight has been lifted off my shoulders and I can finally move on.