To mingle, or to remain completely single...?

Should I talk to other guys, hang out with them? Guys I'm interested in? I don't know what he's thinking concerning us and I wouldn't want to hurt him in any way if he's thinking that we're waiting for each other to see what happens. I don't really think that's what's on his mind, but I could be wrong. And then what if I start to really like someone else or someone else starts to really like me? Then I'm in a pickle. Or a jam (that's sweeter). I'd much rather have him than anyone else, but CAN I have him? And how long will it be before I know?