We've all heard 'em -- but what do they really mean? From classic breakup lines like "It's not you, it's me" to seemingly thoughtful quips like "I'm not ready for a relationship," we're dissecting the lines guys use and telling you what they really mean. Read between the lines and peep this Guy Guide for inside hints!

P.S. This Guy Guide isn't for the sensitive. We're gonna tell it like it is. Side effects might include bruised egos and hurt feelings. But we promise, it's a lesson you'll be thankful to have learned. Now, read on!

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