I can understand that he doesn't know what to tell you. He's going on a trip with coworkers. He's telling you a long time in advance. What could he tell you that would reassure you? Saying nothing will happen? Saying that the women on the trip are not attractive? I don't think that would appease your mind. Am I wrong? I don't think there's anything he could say that would reassure you completely. You two are in this sitch and you will just have to trust each other blindly sometimes to rebuild the R, even if you feel like you are not ready for that yet. Isn't that part of rebuilding? You need to take some steps into unknown territory every once in a while or your sitch will be stagnant.
I guess you will have to decide if you want open up your vulnerability in the interest of rebuilding trust or not.
