I’m definitely sure he’s being honest about the relationship with his wife he sends me photos in the evening and he’s definitely sleeping on the sofa long term
Every Other Woman is convinced that HER specific cheat is telling the truth about the sad state of his marriage, how it's all his wife's fault, & what a noble hero he is for staying "for the children".
So what if he's on the sofa?
He wants you to be his bit on the side. That's not exactly the action of a friend, is it?
The last thing you need right now is this kind of complication.
You are already enmeshed with one abusive man - you don;t need to take on another.
And it;s very common for the 'rescuer' type of man to emerge when a vilnerable woman is struggling in an abusive relationship. 'Rescuers' are attracted to women already beaten down by abuse. This man does not have your best interests at heart. Stop sexting with him.
Please contact WA.
You need an ally in real life, not just support on a forum.
Your husband, by "not allowing" you to work, is financially abusing you.
It's his responsibility to pay at least half the childcare costs if you want to work.
If you lft him, you could enforce mainatenance payments through the CMS, get benefits to support you & your children, & - depending on their ages - part-funded childcare.
If you stay, you will remain isolated, at your partner's mercy, with your only outlet your contact with this man. Is that what you want from your life - a miserable, abusive relationship with one man ... & some sleazy sexts & maybe occasional sneaky meetings with a cheat?
Talk to WA about your options. Discuss how you & your DC could move back to your previous location, in reach of family & friends. Get back to work, stay single, & focus on building a new life for you & DC where you can create a happy, safe, home environment for them. It won;t be easy, but it's going to be easier than throwing your life away on these 2 disastrous men.