Libra different personalities...is he ready for a relationship?

I’ve been dating this libra guy for about 5 months now. we call each other bf/gf but he’s never officially asked me the question to be his actual girlfriend. Weird..

Anyways..when I first met him he was living with 2 roommates (one was a girl, who has been his friend for like 5+ years). He has since moved out. But he still goes back over there to hang with these friends (a guy and a girl) however, he always tries to downplay his friendship with them. he says they’re too young and childish and all they do is smoke weed. yet, I know he goes over there because I found evidence from iMessages in my ipad that he was borrowing. Yet he never discloses the fact that he hangs with them, and sometimes I think he alternates weekends of hanging with them vs me. Which is great that he still finds time to hang with me but….it still feels deceptive because he doesnt tell me. not that he should, because we don’t live together. but what’s the big secret? also…he doesn’t bring me around them and i’ve asked him about this in the past and he attributes it to their immaturity. which I don’t find to be true because they’re pretty funny to me (judging from the one and only time i’ve been around them.)

it’s just weird and makes me wonder if he’s had some type of relationship with the girl at some point and doesn’t want it to be awkward or for me to be jealous? idk but he acts so mature around me and seems like he wants to be in a relationship but then he pulls away and i wont hear from him for half a day, whole day, sometimes two. i’m sure when he’s around them is when he can “let loose”. i just wish he’d be more upfront about it. and i myself am not sure how to address it or address the terrible nauseous feeling in the pit of my stomach that i’ve been having when he disappears on me.

is it normal for libras to want separate lives from their partners? how should I address it with him? everything else is great in the relationship, just feels like he’s being secretive.