Is this a cold hearted thing to do?

I caught my boyfriend looking at other women while we are on our dates. Besides this, he just doesn't seem very obsessed or committed to me. He has been canceling dates due to being busy etc. I'm just not impressed by him nor do I see a future between us.

But I do know he has a very cute handsome tall coworker from his job. I am thinking about going through his facebook so I can message this cute guy. If he says yes, then I will dump my boyfriend.

Is this a cold hearted thing to do?
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