Plus, you already love spending time with each other. Maybe it just says the right person hasn't come along yet, or maybe that right person is already there. They're the first one you call when you need help ... If your best friend trumps your serious boyfriend or girlfriend, that says a lot. You've put off finding a significant other just because your best friend fulfills so many aspects of it already. At that point, though, you just need to start dating. If you've ended serious relationships because you refused to give up your best friend in any capacity, that says a lot. They always know how to cheer you up when you're down.
I want to tell you that I have met a terrific guy, he's sweet, generous and very loving, and of course I met him through your agency, it's a miracle.
Ok it's early days, but I am very very happy, and so is he.
If you feel like they're checking off a lot of the things on this list already and you don't feel the need to find someone else, then you should either commit to them or cool things down a bit so you can find a fulfilling relationship. You've never tried to set them up with your friends.
This is what separates the "just friends" from the "eh, we're just friends for now." At least once, you've had a few drinks, gazed longingly into each other's eyes, and went at it. You might not realize it consciously, but you'd rather be texting them exciting news than your own SO ... This one sounds cute, but in reality, it's probably not too healthy.
You will just notice that your friend is starting to enjoy your company more and both will end up being lovers eventually.