Stuck with ex-husband and feel sorry for bf

So like the little says, I have an ex-husband and a boyfriend. I’m posting this anon because I’m embarrassed by the whole stupid situation.

My ex-husband cheated before he got me pregnant.

I found out the month before I gave birth to our son. When I found out, I left him. Our son is now 5 months old and I have been dating another man for a little while now.

Well, unlucky me, we rent this house - my husband and I are both on the tenancy agreement. Neither can force the other to leave. He refuses to move out - he wants another chance to “prove himself” to me and our son.

Welp this was already his second chance.

He cheated a year into our marriage and because it was emotional rather than physical and my head was all over the place from

IVF hormones (no joke, I was crazy emotional), I agreed to give it another try but I told him if I ever find out he’s done anything else, I’m gone. Well he has, so I am!

I’d move out but I also have my elderly mother to look after, I’m on mat leave so not much money and tbh I can’t afford to go anywhere rn even with the pandemic making moving difficult. He can go back to his parents and he’s still working so he could afford his own place if he wanted, he just refuses to leave.

I feel trapped and I’m sick of arguing with him cause he wants another chance. I’ve already made it clear that he will not get one and that the only contact I want from him is with regard to our son. We obviously sleep in separate rooms and only see each other in passing.

I’m wasting so much energy on this I just feel like I’m ignoring my boyfriend and that I shouldn’t be burdening him with all this.

A new relationship should be this heavy. He’s already been showing patience and understanding with me going through all this and I don’t want to hurt him, but I feel like he deserves better than me.

I just need a place to write tbh. I’ve been pretty isolated since having my son and the pandemic etc so I’m not in contact with many people and they all have lives too - I don’t want to burden them with this mess either.

UPDATE - sorry, I had to repost as someone quite rightly pointed out I didn’t post it anonymously. Lack of sleep and crying for 2 days straight can mess your head up like that, I guess - there was another reply about being patient as well. I want to say thank you both for replying, I’m just not quite ready to expose myself with this mess.