I really think the best thing for you is to focus on yourself and leave that situation alone...if you don't like something (smoking/talking to ex and ect) then you should not deal with someone with the thing that you don't like. I really think the ex and you showing up on the trip was a issue before you started to drink...Also never drink anything you don't know what it is...you should really check your friends...why would they want to make a butt out of you especially if they know you care for this woman. If you are talking with a woman and they are still in the past why would you want to be their future? You know...