What should I do ?

I been with my bf for 2 years, he has 2 kids I still have not yet met them which I feel in my case I can understand I know that’s really important to him and I wouldn’t want to meet them over it being pressured. He did however say his kids mom knows I’m in the picture though and Ive met his family.he recently said he talked to his kids mom about me potentially meeting the kids but that has not happened yet...Heres the thing I feel like I trust him...but within the past 2 years hes NEVER allowed me to see his phone, when I spend the night he charges it away from the room he claims he uses his moms charger I’ve brought up the conversation and his response is that he’s not comfortable with me seeing his phone...at one point I even said it’s me or your phone it didn’t got well and i was dumb enough stay, obviously it’s not confirmed somethings going on and I feel like I really trust him but because he refuses I have that one percent doubt within me..he also never post about me he only has one form of social media but he never takes pictures of us or post about us