To love or not to love?

SoOooOoOoOo, before I met my partner I was talking to one of his good mates and we were going to get together and date but we didn't because things went weird, but we never stopped talking... I then met my partner and we've been together for over 6 months and I do love him! But I can't shake the feeling for his friend, there's just something about him that I'm drawn too! Maybe it's because I can't have him?? What do you ladies think and what should I do??