I had a very similar incident happen.... and I was told to stick it out and move on because it was "in the past". No, that's not OK advice at all. It still hurts, it still happened even if it was years ago and we were much younger and much less mature (extremely immature on his part). I questioned everything in the last 10 years when I found out. To the point that it was in past is a thing but then what else? 100% honesty needed moving on from here no matter which way you go

I would suggest taking some time to yourself and figure what you actually want, your values and what the future goals are.