Technically, no. I mean, you’re basically being mad at him for not being in the mood. Would you feel that’s fair if the situation was reversed and he was upset with you for not getting turned on one night?
My guess is that your feelings were hurt because you took it more as “he’s not turned on by ME” rather than he’s just tired. He might have even been lying about jacking off because he wanted a better explanation for simply not being up for sexting. Do you guys ever just talk? Or maybe he wasn’t lying and he really did masturbate a lot that day and wasn’t able to keep going later with you (he would have been kicking himself for that).
It was just one night. Maybe you guys should sext every other night instead, take the pressure off the “almost every night” thing. Less frequent, more intensity. If he continues to act weird and not get into it that much, then you might want to ask him what’s REALLY going on.
Otherwise, no, don’t be upset with him. If you’re frustrated, just take care of yourself. He has every right to say no…even if it stings a little bit when he does. As long as it doesn’t become a habit, you guys are fine and it was just a one time thing.