Is it because he's the only one I've been with?
Most Helpful Guy
If he was doing something that made you terribly upset that last week you were together then you probably shouldn't bother going back to him, he's going to be the same guy.
Look closely at how you feel, think carefully about why you were tired and angry before. If it was because you were just wanting to see what kinds of guys you could find then now that you've been out there and seen that things weren't as much fun as you'd hoped then it might be worth your time to talk to him again - perhaps you had a little maturing to do.
Think it over, if the problems were his, leave him alone. If the problems were yours then call him - if you are serious this time.