You ended a relationship because you loved him but he didn't love you, he only liked you. You weren't really a priority. He was sad. You were heart broken. A year passes. He reappears, is in a much better place mentally (now fully healed post divorce) and says everything you ever wanted to hear, I want to commit let's do it properly etc. You ask and he admits he had a couple of flings during your time apart. Hurts, but it's not your business... but one of the women was someone you always felt jealous of / very threatened by and he knew this. Can you see past it?