Is it wrong for exs to share happy birthday wishes on their respective birthdays?
It would normally not be wrong at all and I would usually encourage good relations for ex spouses. But, in your case with infidelity involving her, it is not at all OK. Most cheaters are serial cheaters and I have no idea how you get trust back once there is infidelity. To me, infidelity is a marriage ‘deal-breaker’. I’m not even sure if it is worth it to save a marriage like yours to be honest. If things keep ‘popping up’ as you say – it does not look good. Only you can decide what you are willing to put up with. I wish you luck and peace.