idk how to feel

FI and I went to a going away party..he was in the car with his cousins and I asked him what were they doing in there he said nothing just talking so for some reason I didn't believe him then I asked him again and he said they were smoking a cigarette so Obvi I got pissed like why lie. I got tired so I decided I wanted to leave and he didn't want to go he said he wanted to stay with the family for a bit longer and I got pissed about it like we want you to come home with us now(my son&i) and he's just to busy with the guys talking and having some beers. Do I have every right to be mad