Trust issues postpartum?

So my baby is 6 weeks old and my husband is deployed. I’ve never thought about him being unfaithful before but he left back to his duty station when our LO was a couple of weeks old after coming home for the birth.

Now that he’s gone things feel so different between us. Like there’s something going on.

Has anyone experienced postpartum issues as far as that’s concerned? I don’t feel depressed but it eats at me inside thinking he could be doing something.