Feel like SO is still Cheating !!!

I feel like my SO is still cheating on me!!! First he takes his phone everywhere even when he gets in the shower !! Then when he's on it he tilt it so I wont see what he's on 😢 he's cheated in the past and hurt me bad but I forgave him and we want to rebuild our relationship but how when I dont even trust him and his sneaky ways !! I just dont know what to do and Im 7 months pregnant .....Is it just the hormones or just me dwelling on the past !!!!! Any Advice would be great !!