In Desperate Housewives Season 1 Episode 1, Julie (the daughter) told Susan (the mother) to ask Mike out. Susan said she didn't know if she's ready to start dating.
SUSAN: I don't wanna talk to you about my love life anymore, it weirds me out.
JULIE: I wouldn't have said anything. it's just...
JULIE: I heard Dad's girlfriend asking if you'd dated anyone since the divorce, and Dad said he doubted it. And then both laughed!
What does the bold part mean? Is it part of 3rd conditional?