If you had a first date...

[bellareina]

And you had a lot of fun, laughed loads and felt a connection with a man but had an inkling that a man could be bad for you... would you see him again?

I'd say drop him, don't ignore your thoughts or instincts, it could be you just don't like him as you have detected a trait that doesn't suit you(can't put your finger on it) but all the same drop him like a hot potatoe, no point wasting time on some you are not certain about.