[C.H]

I have to concur with Professor S on this. Don't spend to much time wondering about rights and wrongs of the situation, friendship requires communication, and even if your 'friend' had a thing for your ex while you were with her, he could have talked to you about it before pissing over your long time planned roadtrip, as someone else said, somethings you don't do. Take it as a lesson, cut ties, perhaps deal with a period of lonelyness, but your self esteem will be better in the long run if you don't allow your 'friend' to grovel and justify what he's done so you can still hangout.