
Unfortunately it sounds like mom was definitely a cheater before she got married because idk how tf anyone could have sympathy for a cheater. Not to mention it’s for the one who cheated on her daughter. To answer your question, yes it is extremely valid. Your relationship will always be plagued by the one wrong and you won’t be able to just forget it and move on. A normal boyfriend wouldn’t bring these worries onto you and you deserve better than normal
Nope, fuck that guy. It was over the moment he decided to go out and cheat. Cheating is a choice damn near 100% of the time, if they’re willing to do it to you once, they’re willing to do it again. Doesn’t matter when it happened, he showed you clear as day that you can’t trust him. Not cheating on your partner is literally the bare fucking minimum in a relationship, it’s crazy that he had to be told not to do it and STILL actively went out of his way to fuck someone else.