The problem you are experiencing with Eva is fairly common. She is guarding you, probably jealously guarding you because she knows your bf is not a threat. Eva probably just wants you to herself when you are snuggling in bed.
Here is an article by trainer Victoria Stilwell about resource guarding:
https://positively.com/dog-behavior/...urce-guarding/
You could try a couple of approaches to fix the problem. One would be to have your bf bring a treat for Eva when he approaches the bed. Praise her when she behaves.
The second approach would be when she reacts negatively to your bf, calmly put Eva on the floor. She will learn that if she doesn't behave, she won't have access to the bed. The key is to stay calm and not feed into the negative energy.