If you want my opinion on this, it all depends on how you bring it up to them. personally I've felt bad hearing about exes when somebody compared me to them in a way that was meant to make me feel inferior and jealous (emotional abuse) but i am sure this isn't what you're doing.. the reason why a lot of women are insecure is because many of us have been in abusive and toxic relationships and we were kinda raised to feel like we need to compete with each other.. but in reality when you are in a relationship you need to learn to trust the person that you love it can be pretty difficult sometimes but it ends up being very rewarding.. i think in the beginning of intimate relationships jealousy is normal because everything is still very intense and new and a lot of people fear losing their new partner, at least that's my experience.. but eventually that feeling should go away.I am 100% with you but, unfortunately life has taught me that most insecure gf are not capable of earring about ex, or mums.