Our expert says:
Sounds like an awful lot of emphasis on "fun", and unusual that he so often contacted you to emphasize that he was fine and having fun.
Nobody can answer the questions you have except your boyfriend. Maybe it was mostly innocent, other than getting unwisely drunk, staying up too late, and so on ; maybe more happened. He will probably remember it ( alcohol can interfere with one's memory for events ) but only he can tell you. If he won't, that does suggest that he may have gotten up to some things he feels ashamed of. But discuss it with him, fairly gently and calmly ( if you want to improve your chances of getting as useful response ).
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