D.B.
Wow, do I know where you are coming from. I'd been seeing a man for 2 months when my 5yr old told him that he should marry her mommy. I about fell over, but he handled it well. However, this did scare him a bit. Not that she said it, but because he realized he wanted to, and is the type to be scared by his own feelings. Instead of talking to him about it.. I talked to her. I explained to her that although we see a lot of eachother, and he is mommy's boyfriend, we aren't hurrying into anything. He might be around for a long time but that doesn't mean we might / might not get married. She needs to learn what to and not to say.
Anyway, being a single mom and dating is NOT easy. But good luck!!