I've got two young dc and ex decided he didn't want me/family life. He skipped away and carried on his career whilst mine faltered, I've got sole custody of the kids, had to move from a nice family home to a smallish flat as that's what I can afford etc.
When I see happily married couples, parents getting help from grandparents etc I get jealous and bitter. I have no help and recently ex forgot our dc birthday which tipped me over to real bitterness.
He does see the dc and isn't all terrible (he helped me get my car motd) but I'm bitter about the life I could've had. I'd never have chosen the life I've got. I'm guessing some of the resentment fades as dc get older and more independent.
How do you deal with bitterness? It's been two years for me, though only really arose recently due to dc starting school.