You can't know. People change. It can take a lifetime to get to know someone. I'm sure you've gotten great advice but I haven't read through this thread. It takes time. One thing I picked out from here is it was said "If you enjoy each date keep dating him" or something to that extent. I did that. Relationships all take effort in the end and people can expose their true selves years later when you live with them. Wishing the best for you.