You’re not being sensitive, it’s just your husband starting to be calculative.
My advise is, put all your kids in school, get a part time job and build up your own income. Only when you are financially stable, then you don’t have to bother about your husband or afraid when he will just leave you and you don’t have financial back up to feed your child. At the same time, take care of your own body, recuperate. Everyone can promise when they want something, but when they got it, that promise can be easily broken.
If it’s for his own child and he doesn’t want to do it willingly then it’s useless. I am in no position to advise you whether to stay or leave this marriage because end of the day, you are the one who will be going thru everything whereas nothing will change on my end.
I would sit down and have a proper talk with him, if you all want to continue doing life together, something has to change. On your end, I know you’re feeling all the negative vibes and feeling very betrayed by your own husband but if you really decide to talk to him, you have to control your emotions. Hope everything goes well for you 🙏🏻.