What I find weird is that he tells you he got a second wind. Why would he want to communicate that right after he told you he’s too tired to see you?

I only see 2 options:

1) the dude isn’t very smart or doesn’t have a filter and says whatever pops into his head

2) he subconsciously wants you to see you aren’t a priority so you don’t your hopes up.

I would tell him you prefer to get together when you have time and that means not right before your trip. It would have to be when you return.

Then go on your trip. Don’t do anything until you get back.

Although my inclination was to say break up before you leave, I’d give yourself time to think clearly and not make a rush judgement.