Quick Advice Please

ask. he may not be certain he's making the trip yet

"Thursday, he was talking about inviting me on a road trip for this weekend he is going on and would let me know first thing this morning if he was going to take a date or not (so I could arrange to take off work). "

I think it's fair to assume if he didn't do what he said he would do as in contact you first thing early in the morning about taking a date then he's not taking a date, even after you contacted him he didn't say anything so If I were you I would take it that he's not taking a date or just not taking me and leave it alone.

What if he contacts you last minute or in the middle of the week. Will you still try to go?

+1 with tiki. Let it lie.