Personal privacy or suspicious activity?

I've been dating my boyfriend for 3 and a half years. He has full access to my laptop, email address, and phone. I dont have any password locks on my devices.

Every other week I catch him looking at my files or my apps and taking pictures with his own phone. Like he will take photos of my selfies or Facebook notifications. He will ask who I'm sending selfies to (I don't send them to anyone & I don't post 99% of them). He will also get upset at my weightloss progress photos because I will be dressed in underwear when I take them.

He is always asking about what I'm doing the second I pick up my phone. I left my phone in the bathroom when I took a shower & he FREAKED. OUT. He admits it's because he's "cautious". However I've done nothing wrong in the last 3 years and it hurts that he's so suspicious.

Another note... I don't have access to anything of his. He changes his password every couple weeks & has TouchID on his iPhone. He also makes certain things private on Facebook so i cannot see them but other people can. Like friends & workout photos. Also has a private Instagram that I've seen but he says he deleted it.

Am I just paranoid? I feel like he has a guilty conscience. But maybe he just has double standards for privacy?