what should i do? fiance 29M told me he has feelings for both me 22F and his baby mama 29F

hi, i 22 F and have been dating my fiance 29 M for the last 9 months. In the span of these 9 months, i have moved in, we found out i was pregnant, and asked me to marry him. my fiance has 3 children with two other women, and the last women he was with for 7 years and they have a very sweet boy together. their relationship was not good at all though- so i thought. but every week its always about her, i always hear stories about her, good and bad and just how it was when she was around. and she literally hates me. his babymama has told him to tell me to “pack my shit and go home to my family” twice, “i fucking hate her”, and “she should get an abortion”. i know he cares and loves her and his son in a way where its family. i get it. but i can tell there is more. so it always made me question everything about how he feels for me because i feel like he kind of caters towards her more emotionally and hears her out, and when it comes to me its like a big fuck you and doesnt meet me at my needs (i dont ask for much at all.). remind you i literally cater to this man and his children when we have them. he tells me how he appreciates everything i do for him, but when it comes to me asking if he could show me some affection or reassurance, he gets pissed off and shuts me out and proceeds to tell me “dating you is like a chore”. and usually compares me to baby mama that “he would never go back to.”

so last night, he told me he has feelings for both of us. how he doesnt know if he is making the right decision and he thinks about it a lot. he told me when the feelings started, etc. i. am. heart broken. he told me that he decided to tell me this so we can make our relationship stronger and fix it. yeah right.

i am 6.5 months pregnant, literally have done everything for my fiance since the start to show my love and care for him and his family, i feel so stupid and confused and just upset.

do i just stay with him while he figures his feelings out and for the sake of our baby? or do i fly home to my home state across the country and be with family, do it all solo? i really need advice and another parents take on what they would do.