What should I do if....?

another guy asks me out or shows interest in me even though i've been out with this one guy 4 friday nights in a row? He hasn't made a move or anything, but he's shy. He hasn't called or texted me, but I text him sometimes. He's kinda short, and I'm really tall, so I'm starting to rethink it, and now I think this other guy who's taller than me is interested in me. What should I do? Should I give the guy I have been going out with a chance, or move on?