My boyfriend has depression

Im dating this guy, who i had been friends with for several years prior to dating him. I always knew he had something going on in his life - rough family life and lives at home - but since dating Ive realized he suffers from bipolar disorder and depression. He also deals with anxiety. Some days he seems just fine and treats me so well. I feel so loved. So unbelievably happy.. like this is exactly who i want to be with. He’s warm and affectionate. Other days.. which seem to be becoming more frequent.. he isnt himself. He’s constantly in a bad mood. Is negative about absolutely everything and starts to say things that are just insensitive. If i ever get mad.. which isnt often (i feel like hes going through enough) he does what he can to fix things. Says if he loses me that would be the worst thing to happen to him. That he doesnt deserve me. On his bad days it feels like he hardly wants to see me.. seems like he doesnt want to even touch me when we are together. If he does have his arm around me it feels stiff. I feel so alone. Hes disinterested in the things i have to say. He becomes rude. Interrupts me. Says rude remarks. And then sometimes he breaks down and apologizes like crazy for being such an asshole and that he has trouble controlling it. He can see it happening but acts like a different person. Reading this it sounds like i should break up with him. But then he has a good day... and..it seems impossible. I dont know.