My Husband (m27) Has Been Unfaithful And Refuses To Provide For The Family

We have been married for 5 years and have two kids under 3yo and the lack of stability and worsening financial situation has me thinking I should leave. Most of the bills are in my name, including credit card debt and various collections that I may need to file bankruptcy on. I pay for at least half the expenses and do most of the work taking care of the kids. He’s a good father and husband…when he wants to be but lately he’s been running away from all of his responsibilities, spending weekends at the club and most days staring at his phone on Instagram. All I want is a stable, two-parent household for our kids but I fear that is no longer possible especially with him refusing to pay the bills or even buy food, diapers, wipes, etc for the kids. I’ve had to lean on my family for help and work as much as I can as a stay at home mom to try to make ends meet. I feel like the only option is for me to move back home, several states away, and try to rebuild. It breaks my heart to think about the kids not seeing their dad but staying could mean losing everything and I can’t let that happen. He’s always waiting for me to save the day and I don’t think I can take it anymore. What should I know about separation and bringing the kids with me? I want to work things out between us and not involve the courts but I also want to be smart and protect myself and the kids. He has just as much right to take the kids himself, but I know I would provide more stability than him at this point. TIA