Is it normal for behavior changes to occur after a stroke?

My father had a stroke on September 11th of 2021, it was a bad stroke that left him where he could not walk and move most of his left side. His roommate wanted nothing to do with him and told me from the beginning that she was not in love with him and there was nothing there but was somehow interested in where everything of his was going if he didn't make it through the stroke. His behavior changed from the roommate's perspective to the romantic one the night of the stroke. He spent a month and a half in the hospital where my brother and I went every day to visit because he needed the support and all he could focus on was none of his friends showed up. He did not have health insurance and made too much from social security and his age was not old enough for their benefits. He was getting worse demanding he needed to go to his house and the roommate was unwilling to care for him and he couldn't even walk. Fast forward it was time to get him out of there, so I took him home with us to care for him for six months. I love my dad but this woman at his home is toxic and he lives in fantasy land, would not call him or message him until she was worried she may not have anywhere to live. My father is not a rich man by no means he just has a little house that needs a lot of care and a small sum of money. I guess this is going nowhere but he left me for that and now I will not deal with her and him and I feel guilty. I know she is not taking care of him and just using him but I just feel so helpless. It was like one minute he knows what he is doing and the next he is acting like a toddler. I know when he left he was annoyed with me because I finally got a day or two to myself with my toddler (he would get jealous of the attention given to her) and telling me that my brother and I left him when we got married. I guess just I am verbally vomiting. I just don't know what to do and I feel so guilty.