So sorry to hear. Wow. I had a feeling something more is going on. Usually men who use women financially are up to no good in other areas of life as well.

While you lavish him with extravagant amounts of money, babysit and let him live in your house, he enjoys sleeping around traveling with other women and isn’t even hiding it in the community. Why would he admit to anything? It would mean his cushy life style might end. This other lady might not be willing to support him financially.

Please see a doctor and check for STDs. I knew a lady who contracted HIV from a partner who slept around. Not worth it.

You really need to look into roots of your willingness to be disrespected like this. My husbands ex died the same tragic death as your boyfriends ex. It’s tragic but isn’t a sign for me to become a doormat. There is zero need to allow men to walk all over you regardless of circumstances

You could stay in his kids’ lives of course if all parties agree to it. You could even adopt this child (later not right away) if he and his father agree to that. But please respect yourself