We do a lot together, a lot of couple things too. We ultimately get eachother and are most comfortable with each other than with other people.

We have a few laughs, though lately its calmed down and I see that there's this new female friend he has that makes him laugh super hard (they only met a month ago and seem to have bonded really well).
Anyway, I'm not jealous about them two because she's taken - though a flirt - I have told my boyfriend about this and he knows to set boundaries. He isn't interested in her but finds her really cool, chill, and a great entertaining friend he enjoys his company with. Okay, this might make me a smidge jealous.....

Over a year ago my boyfriend told me that I was his best friend. But how can I tell he wasn't just saying that because I said it? And I don't want to blatantly ask, but what signs are there (that separate being a couple and being best friends?

Since we have calmed down lately, I feel like my life is so stagnant that we don't have as many laughs or adventures together. 
Likewise, he is 'Sagittarius' ie. He isn't very emotional/likes to speak of his emotions - though I have taught him to be more expressive, so that's good :) - so we don't have many emotional talks on his part (meaning if he's upset he will tell me honestly, but he doesn't like making a deal out of it... unlike me who loves DnMs). The most expressive he's ever been with anyone is with me. And i'm happy about that.
user
How can I tell if I'm 'best friend' to my boyfriend?
assistant
We do a lot together, a lot of couple things too. We ultimately get eachother and are most comfortable with each other than with other people.

We have a few laughs, though lately its calmed down and I see that there's this new female friend he has that makes him laugh super hard (they only met a month ago and seem to have bonded really well).
Anyway, I'm not jealous about them two because she's taken - though a flirt - I have told my boyfriend about this and he knows to set boundaries. He isn't interested in her but finds her really cool, chill, and a great entertaining friend he enjoys his company with. Okay, this might make me a smidge jealous.....

Over a year ago my boyfriend told me that I was his best friend. But how can I tell he wasn't just saying that because I said it? And I don't want to blatantly ask, but what signs are there (that separate being a couple and being best friends?

Since we have calmed down lately, I feel like my life is so stagnant that we don't have as many laughs or adventures together. 
Likewise, he is 'Sagittarius' ie. He isn't very emotional/likes to speak of his emotions - though I have taught him to be more expressive, so that's good :) - so we don't have many emotional talks on his part (meaning if he's upset he will tell me honestly, but he doesn't like making a deal out of it... unlike me who loves DnMs). The most expressive he's ever been with anyone is with me. And i'm happy about that.
user
I don't know what to make of my boyfriend's (24/F) best friend, but I'm happy for him... but I can't be sure about him becoming my best friend because I don't know how to tell.
assistant