Am I wrong?

So I am 20 years old and I recently moved out of my mother’s home into my own apartment with my boyfriend who is 26, and we aren’t even fully moved in and his mom is already staying with us...because his mom and his dad are breaking up, his dad changed the locks to their home so now she has no where to go, I am trying to be sympathetic towards her situation but I wanted to enjoy my new place before even allowing anyone to stay with us, we only have a one bedroom and it is too much for me right now, I touched lightly on the situation to my boyfriend and asked him if she is here long term and he literally said she can stay however long she needs to...which I was not okay with lowkey, he did not communicate with me or even asked if I was okay with it, rent is already 1300 not to mention the electric bill and cable amongst other things, his mom is an older lady in her late 60s and whenever my friends visit they like to drink and smoke and play games.. plus we would talk about certain things that we wouldn’t talk about around people her age it’s kind of awkward. Am I wrong for not being okay with it?

Ps: I don’t want anyone thinking I am being an Ahole towards his mom I love his mom dearly and she is very nice to me, however we only have a 1 bedroom at the moment that we are currently still setting up, there’s furniture still coming in and things that still have to be taken care of so it is a lot going on right now, but I do believe in that she has to help herself before anyone else can help her, either looking for a plan to find her own living space, saving money, etc.. I just would have liked it to be discussed with me first which my boyfriend did not do.