Evolutionarily un-weird

Teddybears, flowers, chocolate and jewelry aside, exclusivity is the most valuable thing I can ever give to anyone. It represents all the opportunity costs in time, in feelings and, most importantly, in memory that I am willing to give, but can never get back -- not even when you do want to give it back.

Once you let someone in, there is no turning back. It is not just the pain, but this someone will always have a space in your mind, your memory. The places, songs, scents, words ... all that will remind you of that person. Your emotional real estate will still be occupied no matter how hard you try to pursue an eviction.
You are marked with a scar.