<human>: Can you succinctly summarize the text in 1-3 sentences?

My SO and I are currently living together and his bestfriend who he has lived with before is moving to our city in a month and they both want the three of us to live together.

SO's perspective: -We will save a couple hundred a month. -He's a great person and easy to live with. -We can live in a house with a yard in a better neighborhood. -The friend works all the time so he won't be home much.

This is all true; however, I'm extremely upset about this because... -I'm an extremely private person. -I feel like we're too old to have roommates. -We are going to start trying to conceive soon. Someone else living with us will likely...interrupt things. -We're not hurting for money, so saving a couple extra hundred isn't a big deal. -He has a three year old (kid didn't exist when my SO was his roommate) Great kid, but we can't stand him after so many hours. We will be the only people he knows in the city and have already been told we're expected to babysit. NOPE.
I have plenty of free time to help out, but I draw the line at babysitting. If the kid is here without the parent, I'm going to make it a point to not be here. (I'll be at school or volunteering more.) I don't want this drama.

What else can I really say to my SO since he already knows my concerns? Am I being unreasonable?
<bot>: Bf wants us to move in with his bff who has a kid. We're too old for this shit and I'm not a babysitter.