Why won't get divorce his ex?

[SunSet1981]

I met my partner two years ago. He told me him and his ex split up four years prior and don't have a good relationship as she cheated on him and moved her boyfriend in 2 months after he left. He said they'd both been unhappy before her affair for a number of years so what happened was kind of a blessing.
He told me she was not pushing the divorce as she wanted money from him. He has had a hard few years with his business and declared bankruptcy at the start of last year.
He pays her child support, which I believe is far too much, as especially now with the bankruptcy however, they are his children and I don't interfere. His ex claims all the benefits she can; gets a rent cheque for her home, child maintenance, reduced council tax, free school dinners, allowances to help with purchasing school clothing, etc, even though her boyfriend lives with her full time (illegally) and has a decent job.
My partner used to take his children 3/4 nights a week as she was 'busy', even though he works long hours and struggled to collect them from school and took them the majority of weekends, until I told him I was unhappy about the days he was taking them due to it suiting his ex's life. His elderly parents would sometimes collect them from school but due to the lock down last year, they were concerned about catching covid from the children and decided to stop collecting them and watching them so often. He now takes them every other Friday and Saturday and they are dropped off home on a Sunday night. Everyone seems now to be used to this situation. However, anytime I mention him pushing the divorce, he says he is 'on it' but he doesn't seem to be doing anything about it.
I asked if she has anything on him, which he claims she doesn't so I do not understand why he is prolonging this process.
I do not live with him but we see him every day and I stay over a few nights a week.

I need advice. I do not want to be with a married man and he knows I want to get married. He tells me I am the love of his life so what do I do?

@teardrop2021

Thats not what you said op so don't change the story to suit. You're a disgrace.

until I told him I was unhappy about the days he was taking them due to it suiting his ex's life.

she could have means which specific days rather than how many days.

I don’t get all the hate here for wanting specific days when you’re meant to have your kids if you’re separated.

I’m a divorced man and I spent over two years trying to get set days for my children to spend equal time with me and their Mum. We rotate on a weekly basis, and the kids have never been happier. I used to feel dreadful taking them to school and having them ask who was picking them up, not having any stability.

It also allows both myself, my DP and ex to spend quality time on our own.

I think OP is wrong in assuming fixed days are better than a mutually acceptable flexible pattern (which works, or at least did until rescinded)

I think going from 4 days a week seeing your kids to every other weekend on the say so of your new partner you don't even live with was the issue. That's a big drop in contact.
@Adsy1988.

She isnt living with a man illegally people can get benefits and work if you think that they arnt declaring they live together report them

@Pippa234 yeah, apologies, just reading the OP again. That is pretty poor, he obviously wanted a hands-on role as a Dad, whereas that didn’t really suit the OP, maybe best to cut your losses in this case and let him be the Dad he wants to be to his kids.

How on earth do you know what money she has?

I find it bizzare that someone would come onto an internet forum, predominantly used my mothers and divulge this kind of information.

You are completely lacking in awareness, your needs and yours alone are paramount.
Iv'e even forgotten the original question, oh yes why won't he divorce his ex?

I can answer that.... you are completely lacking in understanding of being a parent, you are money orientated and if at all in the future he did divorce and marry you, he knows you would further throw a spanner in his helping his children financially.
Future help with cars, weddings, deposits with houses would be fought forciby by you I should imagine.

Then there is the final gift to his children, maybe when he leaves this mortal coil, maybe he still wants his future wealth to go to his children, not his second wife.

Happens a lot.
Expect to split up if you press this request.