Just need some advice really

Okay so I've been with my man for 3yrs and what not I'm 26 and he is 33. He and I discuss marriage and kids and he was like okay let's have some I was like well after nursing school we can have one and move together etc. We said September which isn't here yet and he backing out talking about he has to care for his family they need him. Okay so he and his twin take care of the mom cause they dad died of cancer and they help pay bills she works at a store she is like 60 and stuff. So his twin recently got married to this Filipino lady and they live there the mom is annoyed and stuff. And I feel he want me to do the same thing I'm like hell no his older brother lives there as well he 36 and is lazy w/no job. I said let's just bring the mom with us and she was like I'll go wherever I go cause he loves me and then he says well what about my brother. I'm like god damn dude he is his own man you going to take care everybody shit he married his wife will probably take care of him. I'm like stuck and dont know what to do should I let it play out or just leave all together. Or maybe I'm impatient i tend to be at times.