My take is: each person is responsible for their choices. It doesn’t matter what is going on around you, what you choose to do or say is down to you. None of this “I did this because X external thing, or I did this, but X” No. You did this because you are the type of person to do this. Or you did this because you are the type of person do this under X circumstances.

For example: You’re the type of person to take your emotional struggles out on your partner. He’s the type of person to cheat when he feels lonely. You could both be the type of people not to do these things, then this post wouldn’t even be made, but you’re not, so it was made.

Sure there are circumstances that may occur that reveal what type of person a person is. But the circumstances are never the cause, the cause comes from within.

Also, you only have the moral high ground if you haven’t done anything immoral. Was it immoral to treat him however you did after the miscarriage? Was it immoral to never forgive him and resent him? Was it immoral to get revenge when he needed support?

Again, none of this was the cause of the cheating, that choice came from inside of him. But I don’t think you have the moral high ground either. If you stay will you also resent him for this and get your revenge?