Ok.
You are right to have doubts. His behviour is not healthy for someone who is in a committed monogamous relationship.
If he has female friends, that is fine, but if he is that protective of his phone it means he's still flirting outside the relationship, which means he values the potential in those other women more than the reality he currently has with you.
I doubt he'd cheat at this point, but he's keeping all the pokers in the fire and if one of them reciprocated you'll be out on your ear.
