Guys advice needed!!

So basically my friend is dating this dude since a while now, and there is an 4-5year age gap b/w him and her.. she is 21f… and basically her whole personality has become about this guy, and honestly I expected her bf to have some wisdom since he is older but again he’s as dumb as a 18 year old… like her and i were talking the other day and he was on the call? He was listening to our convo and it honestly made me so uncomfortable, like why tf Does he need to be involved always, they keep calling and texting each other(which is fine) but she meets me(or our friend group) once in 2-3 months and she’s always on her phone even then… i mean I’m happy for her but genuinely this is too much… I dont share anything w her anymore because her bf gets to know and it’s obviously weird right? They’re literally living together(not even long distance) but still wnv she meets me she’s always on call or text with him most of the times and it’s super annoying I’m ngl…