My fiancé keeps snapchatting his exes

I don’t know what they talk about, but I do know one of them is still interested in him and seems to be trying to get with him.

He doesn’t like me snapchatting the guys I used to mess around with (and those weren’t even real relationships) so I respect that and I don’t do it.

We’ve been together for 3.5 years and as far as I know, he hasn’t been talking to them the whole time, just recently. I tried to grab his phone once a week or two ago to take a picture of our baby and he just took it away from me.

I feel like I’m being a paranoid jealous bitch, but at the same time i don’t see a reason for him to be snapping these girls, especially since I respect his feelings and don’t snap guys I used to be interested in.