["My best friend didn't call me to invite me on his road trip last weekend. I have no idea why he didn't ask it I wanted to go.", 'Well that was rude, did you confront him?', "No yet, I don't really know what to say to him. I feel pretty down about it."]
I would ask him how it went and casually say I would have gone had you asked.
My best friend didn't invite me on a road trip last weekend. They went to a nice beach and I have no idea why he didn't call me.