I broke up with my boyfriend because of his kids

I (F25) broke up with my boyfriend(M29). He has two kids (9 and 7) from his previous marriage at 19 which lasted not long at all. we had been seeing each other for seven months officially three months, but our love had grown so deep so fast, that we were decided to get an apartment together. Here we are one month before our move-in day and he tells me that his ex is planning on taking him off child support. That would require him to have the children every other week. Since I don’t have children, I felt that was a bit much. We were moving in September and the child support agreement was to take place in October. I felt like that wouldn’t give us enough time to get a good rhythm in our place before bringing an extra set of humans to care for every other week.

Keep in mind, he works from 11 AM to 8:30 PM and I work from 6 AM to 2:30 PM. That would have required me to be the guardian for the children until he got home and they would be sleep by then. I expressed my concern for this as I don’t have children and that was a bit much for me, so I told him I was uncomfortable with that set up, and he lashed out at me saying “ as a future stepmother that is something you would have to do anyways” . I completely disagree but we aren’t married anyways. If we were, It would be my job to help you, but this setup would be more like me raising the children on my own. Does this make me selfish and an AH?