It looks to me like his small bet on the turn was designed to get you to put money in the pot. It was too small for any kind of hand to fold. His reraise on the end, agian is not big enough to make you fold, IMO. It seems like he wants you to keep putting money in the pot. Maybe a fullhouse, maybe jsut trip 8's, or possibly an overpair. Small chance he has the same hand you do, or a smaller straight. I'd just call.