my bf always gets mad!

so my bf of 5 years always goes on my phone when I feel I have nothing to hide and last night he asked to use my phone and I asked why then he immediately got mad so I replied and said sorry yes you can use it no problem then after he was done he came to me and said so that's why you didn't want me to use it because you were watching porn and called me a slut?? like wtf

then he got mad and said you never ask me to go down on you or anything... and i really didn't want to argue so I said sorry but I think that he should go down on my without me asking I suck his dick without him asking...

and when we have sex he likes to call me a slut and shit so I was just super confused....

an I the only one who's bf gets insecure about you watching porn??

also I would like to add that we have had 2 threesomes and we went out to eat and the waiter was cute he said I should try to be her friend... then I said ok and he said idk how long it would last tho because we would end up having sex??? I currently don't have any girlfriends and this makes me feel like if I do get a friend he will want to fuck them???