I know as a girl i would always thank my date even if i didn't feel interested however i wouldbt stress that i had a good time unless i actually did.
Most Helpful Guy
Do not overthink things. Take him at is word. He had a good time... now does he want a second date? Time will tell. You can always ask him you know. This is the 21st century. If you had a good time you can always suggest getting together again also.
Most Helpful Girl
With all the boys I've dated long term and had relationships with, they've always texted me within an hour after the first date to say they had fun and to make plans for a second date.
For dates where they just say it was fun and it was nice to meet me, it usually doesn't lead to relationships