First of all, why would you post this without even letting us know anything about your situation? From your other posts I see that you are the ex gf who wants her ex bf back and he broke up with you. These kind of details are important.

Anyway, I think it would be a pretty dumb move on your part to take your ex bf. You will feel used if he doesn't get back together with you and that will ruin your trip. You should determine your standing with him before traveling with him.