need some co parenting advice.

long post....

so me and my daughter's father are no longer together so she goes with him every other weekend(wed-fri) because he works the actual weekend and those are his days off.

we also agreed on an amount of money he is supposed to give me a month for our daughter($300) which is 150 less when what I would be getting if I did file for support.

well......for the first couple months he did good with getting her when he was supposed too and paying me her money(he only gave me the 300 we agreed upon 1 time.) and every time other time it has been around $250 whatever no big deal. I'm not gonna stop him from seeing his daughter over money.

but the last 2 months his co parenting and getting her when we agreed has gone to basically nothing. he always cancels or had an excuse or has me get her early. he also is no a month behind on what he is supposed to pay for her.

my boyfriend thinks I should stop letting my daughter father walk all over me and that I should apply for child support. he says its her fathers responisibility and that he isn't doing what he's supposed to do....which he isn't.

I have been thinking about it lately but her father threatens me saying if I file he will be joint custody so he won't have to pay me shit and that his job will hold off child support because they know our situation.

i do want to apply but I don't want a huge custody battle or fighting...especially with me being pregnant and all the stress it will cause.

I don't have a job so what money he gives me for my daughter is for wipes.diapers clothes toys and whatever else. I use her money for her.

he has a girlfriend and her 2 kids which he fully supports and I don't think it's fair to my daughter that he can support them but he can't manage to keep his agreement we had.

he keeps bailing on my daughter or he ignores my messages.

anyways. I just need some advice/input on what to do.

I would prefer no negative comments as well.

I have been trying to co parent and do thing easily but her father stopped doing his part it makes me feel bad for my daughter but at the same time idk what the right thing is to do for her....

do I go out my foot down and apply and hopefully he'll step up and keep his part...

or do I let him slide off with canceling and seeing her when he wants and not paying me to help support his daughter???

thanks mommas.