I doubt we’ll ever know for sure, but my current thought is “no.” Back when ConnectU was HarvardConnection, it may or may not have been a dating site; but I don’t think it matters. The idea was inevitable. There were already proto-facebooks at Harvard and Zuckerberg had already hit on the idea of having a university-wide one. And according to the ConnectU guys, they were perfectly aware of the need to “get there first.” This suggests that they understood other people might have the same idea and act as competition. I suspect that when they approached Zuckerberg, he realized they had a similar idea to his and deliberately stalled them because he also understood the importance of getting there first.
This is, admittedly, conjecture based on reading various accounts of what happened. Since everyone has an interest in spinning the story, the facts are difficult to get at. But there are time-stamped records of bits and pieces of the story, and elements to which all parties agree. In short, it’s quite possible that Zuckerberg is as Machiavellian as everyone thinks without him being a thief.