Pregnant and getting lied too

Should a guy go out every Friday while girl friend is home pregnant?

So just a update,

This passed weekend he went out and didn’t come home, or tell me. He says he went to the bar with some friends.

Well last night we were driving together to the store and his phone went off with a long message from a random number....

I don’t go through his phone but because we’ve been going through some things I asked to see and he wouldn’t let me he go all serious and we started fighting so today I texted him and asked for the truth and he said he will tell me but I won’t like it.... so I’m waiting. Mind you all I’m six months pregnant with his first baby.