He thinks he needs to change around his friends

So I’ve never posted in this group need yer advice on what do you think I should do ?

So my boyfriend of three years hasn’t been out with friends or anywhere just stays at home and then an old friend asked him to meet up in our local town for a few drinks( I wasn’t there this was lastnight ) .. I didn’t hear from him at all didn’t think anything of it just thought he was having a good time with his friend . This morning I woke up with messages and he rang me to say he wanted to meet up he was being wayy to nice as normal this was at 10 am and he’s a lazy guy lol so my gut was telling me something is wrong . I texted him saying is everything okay are ou alright he said I need to tell you this in person so we met up and I was bricking myself he wasn’t himself at all he said he done something so stupid and told me that all his old mates came to the pub and near the end of the night they kept asking him to do cocaine sorry if this is too much info but I need your help .. and so him and friend he went out with both said okay cause they were asking & asking do course he went along to fit it and do it he said he done the smallest bit and they left him alone and not only did he do that he got robbed by them how stupid I know! My boyfriend dosent smoke , drink only occasionally or anything but done this I’m so mad , upset , disappointed I’ve no words I told him how I feel I got so angry and broke up with him and he kept saying he was stupid how sorry he was all that jazz but what do I do forgive him or not ? It’s the fact he done it all to get them to stop asking and how much he knows I’m so against drugs! He said he didn’t get an effects from it he was normal I asked him every question I told him how stupid he was