Why Does My Ex Boyfriend Feel Depressed When He Is With Me

why does my ex boyfriend feel depressed when he is with me? i mean come on, if he dont want to be with me he should just tell me so. im getting tired of him treating me like this. he used to be so sweet to me and all of the sudden he is acting weird. like he is always sad and in a mad mood. i try to give him what he wants but i dont know what else to do.

has anyone else have their bf feeling dpresed for some reason?