People very often get jealous even of things they can't possibly change : partner's past for example (over what we stress ourselves exactly?lol) to the point it gets ridiculous and we start doing stupid things.
Ain't nobody got time for that bebe! Love is the most beautiful blessing,enjoy it! You should never hate or be jealous of your partner's exes, in fact,you should feel happy and grateful! Thank them from the bottom of your heart.
They are probably the reason your partner loves and appreciates you this much ;)