It sounds like you and your kids are quite close, and you enjoy them, and they like being with you. That's very important right now. Your ex-wife sounds rather unstable. Your kids need to know that you will be a stable presence in their lives. Perhaps you will date at some point. No need to rush into that. But, if and when you do, no woman you date should be looked at as having a parental role in your kids' lives. At best, such a woman could aspire to be friendly toward your kids, and that's it. Right now, it's probably good that you aren't involved with a potential partner. Your kids could use some undivided attention from you, which you are giving them.