Reason Season or a Lifetime

so i met my boyfriend when i was just turning 17 before him ive only been in one other relationships where i got cheated on and only lasted 4 months so when we met he was seperated from his wife but i let him know like if they decided they wanted to try again since they have a daughter id have to be okay with it so i wouldnt be a home wrecker also he didnt seperate from her for me its was due to her cheating. this man has been by my side through so much and hes cheated yet i stay with him. i got pregnant when i was 18 had my son 4 months ago. and im 19 now almost 20 anyways he broke up with me when i was 6 months pregnant but let me continue living with him then he got visitation for his daughter finally and i guess seeing us all togther he said he realized im the best girl and he wanted to try again so we are but hes been distant again and had tinder on his phone and i cant go through this anymore. almost 3 years of cheating and i stay because i love him so much and he changes then flips back . right now im thinking hes like this because his divorce finally is official and i think he is a bit hurt like they were together 5 years and he married her because she wanted to and it got thrown to his face. soon his daughter will be staying with us and i mean i take care of her when we go visit and we get along just part of me thinks like ill never make him happy but i want to. like im trying my best. one day i wish to be his one and only and stop having doubts . with him being a bit older than me by 11 years i know hes experienced more so maybe he wants someone who knows all that but like hes the only one of the 2 guys ive been with that ive had sex with minus when i was raped but like hes.my world and hes helping more with our son and i dont know i want a lifetime but im not sure what he wants.