What does it mean when a guy says, "Maybe we'll hang out again sometime"?

I went on a date, with a really nice guy I met on Okcupid. I thought everything went fine he seemed a little self conscious, cause he hinted that maybe I thought the date went bad. After we ate dinner we sat in the park, but while we were sitting down he kind of sat with his back turned towards me. I took that as a sign of him not being interested.

Anyway when we both decided to call it a night, and dropped me off at my door he said, “Maybe we’ll hang out again” So what does this really mean?