For example, I have been in a relationship for 7 years, 4 dating and 3 married. I haven't have sex with my wife for 2 years! Why? Cuz I am BORED OUTTA MY SKULL with her. She and I have spoken constantly about my fantasies. They have to be mine because apparently she has none, I do "IT" for her and she has no need for fantasizing(her words, not mine). I say spoken, cuz she just will NOT indulge in my fantasies or fetishes. Average sex is what she likes and what I like just doesn't factor in.
Now, why am I still with her? My DUMB-ASS still loves her, however I do occasionally indulge on the side. i.e. - CHEAT!! Some of you are gonna ask, well what if she cheated on you? As long as I don't know, I'm okay with that. Even if I did, I can't get mad... I haven't fucked her for two years! My Dads great sage advice on my wedding day, " What she don't know, she don't know, SHE DON'T KNOW!!! ".
Anyway, back to the topic.... sometimes boredom becomes a part of life when your in love. EVERYONE handles it differently. No one answer from anyone will make this person feel better, he has to sit and be honest with himself and live with the consequenses of his choices... I am, are you?