Is this abuse?

I have been with my boyfriend for 5 years. We started dating when we were 15. Ever since we first started dating my boyfriend had an extreme temper. He would hold me down on the floor, throw drinks on me or spit on me, slap me or pinch me over the littlest things, like if I harmlessly said I thought a celebrity was attractive. He would hold me hostage in my own room by not letting me leave for hours during an argument. He would break my things, he broke my phone because I admitted to talking to another guy for 5 minutes when we were broken up and my grandpa had to buy me a new one (we were 15 at the time). He also punched the air vent in my car and broke it and broke my expensive earbuds. When I cry when he is being mean to me he tells me to keep crying bitch or calls me a piece of shit. He currently doesn’t have a job and hasn’t had one for 2 years since graduating. I pay for everything and give him rides and if I don’t he gets upset.

With all of this being said, he is the sweetest guy I have ever known when he isn’t being mean. He makes me things, makes sure I get home safe, has never cheated on me etc. I truly feel like he loves me. I have broken up with him in the past and he cries and cries. One time he waited outside for me for hours in freezing weather to apologize. He cuddles me and shows affection. He has been diagnosed with bipolar disorder and has always had trouble keeping friends. He takes medicine and is a heavy pot smoker to help his mental illness. One time he told me that I’m different because I haven’t left him while crying about how guilty he feels for the things he has done to me.

Is this abuse? I love him so much that it is hard to leave...