Here we go again

I've posted a couple of times before in this group. As I write this I'm on a month long trip and after a night of no sleep and tears my partner has finally confessed that he cheated again last night. While we're alone on a trip together in the same city. We had a stupid drunken argument and that was all he needed to once again blow up our relationship. The worst part is that he lied repeatedly to my face when I confronted him and only finally admitted the full truth after I begged and begged for it. I'm so devastated and feel so alone, unsure what to do next since we're on this trip together. To make matters worse we're going to a wedding of a close friend in a couple of days.

I know at this point he'll just keep doing this when things get a bit tough between us and I would be niaive to expect anything else if I don't make sure there are consequences for his actions. We were in the midst of trying to repair from his last cheating episode a few months ago, so I'm a mess.

I'm not sure whether to finish the trip alone and have to explain to everyone why he's not there or pretend until we get back home and then deal with this in private. I'm not sure the point of this post but any words of support/advice/wisdom, particularly from those who have been the betrayer more than once welcome.