Spray your shoes with Grannick’s bitter apple 

https://www.chewy.com/grannicks-bitter-apple-original-taste/dp/46004

Make your boyfriend’s side of the comforter more appealing than your side somehow. Discreetly put some peanut butter on his side of the bed.

You can also take the time to start training her yourself. It sounds like she’s food motivated to some extent. Bring special delicious treats that she has to work for. Every time she is doing something that doesn’t involve biting at your things, give her a treat. She’ll suddenly start listening to you more.

When the dog starts pulling at his side of the blanket, say, “Looks like she doesn’t want you here. You have to go.” And then laugh. Give that fucker a taste of his own medicine.