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

I have been with my fiancee for over 5 years, and they have been great, but in the past year, things have beeb getting stale, or we're just changing.

One of the biggest changes is that I was almost 300 pounds and was more of a simpler Male, and she's also a large, but beautiful woman. I lost about 100 pounds and became much more adventurous after getting into cycling, and I began wanting to do tours and travels, even plotting out month long ones. The multiple times I have brought these up, there has been much resistance.

We moved in together last year, and it was going really well until recently. Out of nowhere, the attraction just kind of fizzled, and I'm not seeing her like I used to. For the past 2 or so months, I've been slowly thinking of more and more ways to end it, but have made no hints at it. 

The worst part is though, I have no glaring reason why I want to end it. This is a woman who takes such good care of me, and I try to her. I work two jobs to support us and save money for the wedding, and she always has the house clean, dinner ready and her full attention when I get home (14-16 hour days). I swear, she still has starry eyes when she looks at me. 

The last sign I had that there might be a problem with me, is during intercourse the past few days. To me, it wasn't making love, there was no passion, desire or romance. I was just doing the deed until I was done, and was sooner looking forward to sleep. 

Is it actually possible to fall out of love? Have I just grown apart, and my wants and desires change? I try to involve her in all of my activities, whether it be cycling, gaming or anything else, but there is lack of interest. Am I trying, and she's not? Should I end this before I say "I do"?
<bot>: I feel llike I might have fallen out of love with my fiancee, is this a problem we both need to work on, or should I get while the gettings good, and move on?