
Personally I just think people that are overly lustful lack self control & enjoy having variety. It’s hard to think they’ll be satisfied with you for long. Also I’ve just seen ppl go to lengths to satisfy their lustful nature whether it means hiding stuff or hurting people in the process.
Has his lustful nature caused him to do impulsive things that he probably shouldn’t have? During or before your relationship? Is that the stuff that you’ve learned about his past that’s made you feel this way, or did he do things during your relationship with him that made you think that way already? Or both?