Baggage and Experience?

Had a busy weekend and met up with an old friend after a long break in communication. He talked about an old girlfriend and was reminiscing back in the day when they where dating and she had no baggage relationship wise and how it was the perfect relationship with the perfect girl and he just missed it....I almost asked what he meant by that, when he started talking about age and experience and all that and all that....................................

What really do we call baggage in a relationship and what do we call experience?