You know there are times when an occasional "truth dart" is called for. It helps to lift the fog a little. When he confronted you about the trip, you should have told him that it was your decision and that you are not entitled to tell him if you were going or not. Depending on how things were, I would have mentioned your friends being uncomfortable with his GF.

And again, that is his GF not OW.

M-43 W-40
2D - 9 and 5

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet a new life.

RECONCILED AND WISER