Say he does go out with you if/when you lose the weight, what if you gain it back? or he doesn't like something else about you? If he doesn't like you for who you are then all your effort's for? Also I think your lovestruck crush is giving you illusions, "If I do this and change this he will like me for sure". That's my 2 cents.

Wait...I don't even know what the OP said now.

OP!
What is this trickery!