dating??

So my boyfriend of 2 1/2 years and I broke up over a month ago and I'm starting to date again but trying to just keep things light. I started seeing this guy who's so nice and so much fun (which is what I need) but I'm kinda keeping my distance a little cause I don't want him to get too attached to me. Even though it already seems to be heading that way, and I have explained that I want to just have fun cause I got out of a long relationship. Anyways I want to date other people too but I'm afraid of hurting this guy. Opinions??