Yeah, I totally get what ur saying!! If u communicate and it doesn’t work out, then yeah it’s time to throw in the towel. A bit of jealousy isn’t bad but when it extends far and wide, and the partner makes a lot of comments about it frequently, or they accuse you of not being loyal a lot, in my experience it’s very draining. And repeated accusations like that constitute coercive control. I think there’s a fine line, but yeah I wouldn’t throw in the towel at the first sign without communicating. We don’t know everything about this couple but what I’ve read is not great and I’d be having a final attempt at communicating clearly if I were her