Am I overreacting?

So I’ve been married for 20yrs and it’s been one hell of a roller coaster but nonetheless I do love my husband. So I’m 2018 we were going to purchase a home together even though we weren’t in the best place of our marriage. But literally 2days before we were to sign the offer on the house, we got into a argument about him still being in contact with his “baby mama” even though their daughter is an adult. He then decided that we weren’t READY to buy a house.... So fast forward to 2020 he approached me with a proposition about letting his mom “buy” the house & we all live there so when the mom DIES the house can be paid for.. Now I don’t know who wants to benefit from the death of their mother but hey whatever so I agreed; not knowing that when his mom moved in with us in our rental she started doing things that I felt I would NOT be able to deal with up until she passes away (mind you people are living long these days & she’s 72). So when the new house was finished being built I decided not to move with my husband & his mom and we have been in the same house in over 6months.... Am I wrong?