<human>: Can you provide a brief rundown of the text in within 3 sentences?

This has been a re-occurring problem in my life.

I've had 3 longer-term relationships in my life. Two for 3 years... and I am currently in the 3rd and it's coming up on two and a bit years. Now I'm not a nympho, but sex is important to me. In all of my relationships it starts off the same-- a healthy sex life and then it naturally dwindles--- but this can't be normal. In each relationship the sex turns non-existent and I attempt to come on to my significant other and get "nicely" turned down. (Is there a nice way for this to happen?!?!?!)  In the last 4-5 months I can count on one hand how many times I've had sex--- and on one finger how many of those times my boyfriend was sober. 

Anyways... my questions are this: I haven't brought this issue up with my current boyfriend. That has always been the beginning of the end for my past relationships. I need to know--- how do I bring this up?--- what can I do to change my situation? I honestly physically don't look any different than when we first started going out--- I have gotten dressed up, tried making a sandwich, I even get turned down for blow jobs. 

Also-- I don't think it's in a way that he wants the relationship to end-- in fact I think he'd be absolutely devastated to hear I wasn't content.

What do I do? Please?
<bot>: Boyfriend isn't putting out--- don't know how to approach him with this subject and not ruin the relationship. help.