Is it wrong to mess around with a few guys?

There's this guy who I've been hooking up with (not going too far just well you know). I like him but just ended a long relationship not too long ago so I don't want to go out with him. The guy I ended the relationship with still thinks I like him too. But then, I've also been doing the same thing (as guy #1) with my ex boyfriend of 2 years who I just started talking to not too long ago. (This is a different ex) AND one of my really good guy friends wants to do stuff too. I don't know what to do. Is it wrong to do all this?
Is it wrong to mess around with a few guys?
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