He is doing what he does because he can, and to deliberately hurt you. He is getting a thrill out the effect he has on you. The 'intermittent reinforcement' of him being loving one minute, abusive the next (or 'in love' one minute, 'just friends' the next) creates an addiction in the brain. You are like a gambling addict playing a slot machine that you know will never pay out the top prize (proper love), even though it keeps giving you electric shocks, all because of the thrill when it occasionally pays out a few bits of change.
Be really clear - this isn't love you feel, it's an addiction and it is just as harmful. Googling trauma bonding might help you get solid on this, and there are abuse forums on facebook where you can get more information and support.
But be sure, he doesn't love you, he is lying for the laughs. It's what abusers do. do not believe anything he says - look at how he treats you. He abuses you, picks you up, then drops you. This is not how a man who loves a woman acts. Actions are what counts. Words are cheap. Men who love their woman admit when they are wrong.
Just like gambling, the only way to beat the addiction is to stop. It gets easier after the first few weeks, it really does. Proper No contact. Lots of good advice around that upthread.
Because otherwise, one day he will drop off the face of the earth and will have found someone else to torment (though he may 'convenience' torment you when he's bored). Do you really want to leave it up to him when this ends? End it for yourself, for your own self-esteem and self-worth, because you really need that xxxx