I’m guessing the guys have found someone else and want to explore it to see if the relationship has legs?
Cut the ties and look after yourself and get a solicitor.
My ex left me but instead of doing it this way had just been seeing someone for months. She was months ahead of me and while I was still trying to repair the marriage 15 years, relationship 24years, 3 kids. She’d been setting herself up and put money away.
Look after you and your kids. Make them make the choice and by this you will know.