*As long I know and feel that he loves me DP's ex could be Aphrodite herself for all I care.
As for getting over her, it was tough, but we talked about it together. I know it took me time to get over some rough breakups so I could haldy blame DP, it does not mean he loved me less.*
All true Qwebec, although in my case it did, quite clearly, mean he loved me less! I was actually in an almost identical situation to him myself (in terms of a recently-broken heart) and was very sympathetic, but I found it very hard to forgive the treatment I received because I behaved in quite the opposite way towards him.
It was a whole tissue of complicated things which I won't bore you with, but the fallout was that he was always sort of scrutinising me, with a barely-perceptible resentment; like he didn't think I was quite good enough, but not so much so that he wanted to break up with me - or that, in spite of himself, he liked me too much (in other ways than physical) to break up with me. As though he was thinking "well, since I can't be with ex, maybe this is as good as it's going to get. But is it? What if something better comes along?" Realistically, he wasn't seeking something as good as his ex, the only thing that would do was her.
(Or, I sometimes think, someone else who was "famous" even if he found them dull, stupid, and 50% as attractive as me 
But I won't go into that...)
It sounds mad and paranoid when described to a third party, but it's clear as day when you're in the situation. It drives you completely mad after a while.