This is a situation I've always been cognizant of, and am sure the bulk of you will understand exactly what I'm describing.

How many times have you seen couples exit 1 or 2 or 3 year relationships, meet someone new and start a new relationship, but completely neglect to go back to Day 1?

To clarify, it's like they adapt to the advanced stages of a relationship and either struggle or completely fail to wind the gears back -- the new relationship almost always goes up in smoke.

The worst example of which I've seen was my best friend; she left a 2.5 year relationship and met a really great guy who had also gotten out of something serious. In 3 weeks she was mentioning their wedding, and he wasn't much farther behind -- yikes. Needless to say the relationship ended before the 2 month mark.

What steps have you taken to ensure each relationship is treated as the unique bonding that it is, and remained vigilant in not letting prior experiences leak over into places they have no business? How do you be sure you're really going back to 'Day 1'?