I do put him on the spot and he can't handle being put in the interrogation chair.
Think this applies to most of us... The WAS will be on the defensive mode whenever we query stuff about their A. Although we think that we are not accusing or interrogating, the WAS certainly feels that way.

I only asked what he planned to accomplish w/the trip since by then supposedly they had broken up.

Sometimes they tell you that they've broken up or they think that they've broken up. But because of their "addiction", they feel that they need to RUN back to the op. Or, they want to shield you from more hurt and pain (as they do not realise that lying is worse... BUT knowing too much details of the truth will also hurt. ...we can't win, can we? )

And at this point it I guess it doesnt matter,
Yup...doesn't matter. What matters is he is with you now!! (I should drill this into my own head too!! )