Good question. Maybe he never intended to win this thing in the first place. Maybe he wants a brokered convention. Maybe he wants the GOP to steal the nomination from him so he can play the victim, go third party and screw the GOP in every way he can.
I dont know. But right now anyone who numbers Donald LGBTrump among constitutional conservatives either has his head stick in the sand or is a fool.
Or just wants Hillary defeated. Bathrooms are not a federal issue. The 10th amendment leaves it to the states.