I know you hate hearing this, esp from people who you've never met and don't know you personally, but maybe that's best.
Don' t DARE let anyone, esp a boyfriend treat you with disrepect and display such anger as to throw something at you. I don't care how much your dog adores your boyfriend, I almost guarantee. if he's blocking you now and jumping on him, the next step out of frustation and protection towards you will a pretty
unpleasant sight. Then when he starts to fight off or kick your dog..then what??
My brother and I are grown adults. My dog loves us both although I do everything. Once as a test, I persuaded my brother to "slap me 5" a few times so I could go "ouch" to see what Cody would do..a loyalty test. My brother accidently 5'd me a bit too hard, and I really yelled "OUCH" and Cody actually went for my brother's arm. Our eyes popped out of our heads- we had no idea Cody would ever do that. No doubt he'll protect me to the death , I have no fear or question about it.
You sound like a really nice person. Keep the pooch, bag the guy