I’d say make the dog the priority for the time being. We had a similar problem with our dog but saw a behaviourist and the dog is now almost problem free re biting anyway.
You will feel better and more comfortable, once that issue is addressed. I’d say you need to be the boss and don’t let other people tell you how to manage your dog. you need to have that level of confidence. We use a lot of treats and positive reinforcement. I tried the tough guy thing and it never worked for me anyway. Honestly, the more time and work you put into your dog, the better its behaviour gets. Firm boundaries work well. But I guess you already know that.
The boyfriend issue will work itself out in my opinion. If he starts harassing you about the dog, you know he’s not the right person to be with anyway. Sounds like the bite was minimal .
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