If you change partners every time it gets tough or you get a little dissatisfied then I don't think you get the richness that's available in a long-term relationship.
A lot of people resist transition and therefore never allow themselves to enjoy who they are. Embrace the change no matter what it is once you do you can learn about the new world you're in and take advantage of it.
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Sadly we do a much better job of making people feel guilty than we do of delivering them from the guilt we create. We need to confess this and change our ways.