I think this kind of thing happens in all relationships, to some degree. I'm no expert, but in my experience relationships will always lose a lot of that initial excitement. Instead it comes and goes in waves. Life is like that. Hopefully the bonds that you build in those early years will keep you together as you grow old. The more experiences (good and bad) you rack up together, the closer your connection will become.
You say you still have amazing conversations, so you clearly still inspire each other. It's not because you are boring - or incompatible. I don't have the answer (yet) but I do think your attitude towards the relationship makes a big difference. If you foresee an exciting future together you will want to make it work, and put in the extra effort required to keep things interesting. If, deep down, you expect it to fail, then your heart won't be in it and it'll just seem so much harder that you'll want to give up.
All relationships have their ups and downs. They can also take hard work sometimes. I didn't read your earlier thread but this problem alone doesn't seem like a deal breaker.
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