My boyfriend and I agreed we didn't like eachother going out (drinking) without eachother and I asked him was he going out tonight, he said no. But when I was snapchatting him he was avoiding sending pictures of his surroundings and then admitted he was gone out, apparently his mates dragged him along, I'm only so pissed off because his ex took the same taxi as them and there's girls I don't trust around him, and if it was me went out it would be a total different story and he would go mental at me!! what do I do?