Give me a break!! The pup was there BEFORE the boyfriend! The boyfriend moved into THE PUP'S HOME/YOUR HOME, and he is going to tell you what he will tolerate and not tolerate????? I dont think so!!!!
THAT being said, you need to teach your baby how to behave like a civilized little pet!!! You can NOT allow that baby to use your home like a toilet! It sounds like you have taken the path of least resistance, and rather than expend the time and energy to teach and train and control your pups behavior, you have let the pup raise itself, and you now have a dog that does not integrate with other people and has no house manners! THIS is YOUR fault and you need to correct it!
Either resolve yourself to make the time to train your pup to live like a civilized house broken companion, or spend the money and effort to have a professional do it. I am fearful you have a baby that NO ONE will tolerate being around, because of lack of training! YOU have raised a house ape and you need to fix that so even if you are not able to keep that baby, you do not want her to end up on the streets because no one can tolerate her bad/unacceptable behavior!
While I can not stand a man that would move into my home and then begin to tell me how I have to make MY living space acceptable for him,
I can understand where he is coming from. He should have known or noticed after 2 years of dating, (and I am certain he has been at your living space at least once during that time, so he knew how you tolerated your pup's bad manners), that your pup was not well house trained....
.he should have NEVER moved into your space under the current conditions if they were unacceptable to him.