@Mame,
I was too easy on all this too (another story, another year), and rue my behavior (to the tune of where have all the flowers gone - "when will we ever learn").
Once an opportunist, always an..
My ex and I are still friends, similar to you two in that the history is long, and in our case time has passed and we're glad to see each other.
On the other hand, a few days ago was our thirtieth anniversary, whence he sent a thoughtful email, and I wrote one of those letters you never push send on, which I'm glad I didn't. On his persona, people find him arrogant and stiff. I know better or at least see past that. I don't want to be back with him, or he with me, but our marriage pulsed a lot of years of our lives.
I hope in a general way that your ex can see your point of view, Mame, sooner than later, but I won't bet on it.