I'm so selfish

I used to have a person who made me the #1 person for him for a little over a year.  He fed my ego and watered my desire to feel important.  I wanted with all my heart to be able to reciprocate his feelings but my heart belonged to someone else the whole time. 
This week he told me that he had found someone to be his #1 and I felt sincerely happy but I also felt selfishly jealous of her.  I lost his unrelenting devotion.  Even though I knew this day would come some day, I fooled myself into thinking that it didn't matter.  Well, it does matter.  It makes me feel like Jules in My Best Friend's wedding.  I'm a horrible person and yet I am happy with my own partner. 
Told you I was selfish...