Dude, you fell into the “friend” trap.
There’s no escape from it. Every guy knows this.
You have to make a decision: pine away your life in the bittersweet martyrdom of unrequited love, or keep looking for someone who loves you back.
As hard as it will be, I recommend that you maintain your friendship with her and keep on the lookout for someone else. I had a few “dating” friendships where there was not an interest in moving to the next level. We had fun while it lasted. Movies, dancing, eating, etc., but never anything emotionally romantic or physically intimate. It’s amazing how fun “romance” can be when it’s not real, if that makes any sense. Gazing at a sunset together is remarkably exciting when there are no strings attached.
Now, if a few weeks or months from now, your friend decides she wants more from you, I highly recommend you stand strong, and ask her and yourself, “What’s changed in our relationship that has changed your mind about me?”
If “every guy” thinks that his female friends would have fallen in love with him if he’d been flirty with them instead of acting like himself around them, then “every guy” is suffering from some serious wishful thinking! We do eventually catch on to what you’re really like you know, guys!
Seriously, though, the most likely ways a guy can really mess it up in terms of romance with female friends is a) if the female friends have some fear of a break-up that happens in the full view of their entire social circle, in which case everyone in that circle has to find courtship prospects elsewhere (oh, well) or b) if the “friends” have false good manners that they put on for dates, while the real habitual manners they have around “just friends” show what poor prospects they are for the other half of a lifelong social partnership. Other than that, very few guys who are rejected as dating prospects would have stood any better chance if their first romantic approach was as a flirty stranger or mere acquaintance. Not everyone who finds you likeable is going to fall in love with you. Look at the big picture–that is a
good thing!!
BTW, guys with excellent manners around people they are not dating are the kind of guys that their women friends will actually look to match up with somebody. Women do not want to suggest dates to their friends who will embarrass them later. “We didn’t hit it off” is an OK result from a suggested date, but “How could you?” is not. This is why they will tend to play it safe and only “go to bat” for guys they feel are going to be a real catch for someone, guys that the friend who gets him will thank them for. If recriminations are a possible result of their match-making efforts, they’ll just stay out of it.
Oh, and BTW: If a female friend turns you down, and you think of her as a real friend, it does not hurt to ask her what women she thinks might be well-suited. She knows you well,
and she wants you to be happy. After all, if you are dating some friend of hers, then the two of you can be “just friends” and she has two friends thanking her for matching them up instead of two friends moaning that they can’t find anybody–what is not to like about that? She may know what kind of woman you are going to attract, and she may know several good women like that. It does not hurt to ask. If she can’t think of anybody, then say, “Well, keep your eye out. It is nice to spend time with you, don’t get me wrong, but I’m not interested in going through life with only platonic friendships.”
If this friend spends a lot of time with you, OP, I very much doubt she thinks you are a “how could you?” sort of prospect. Give her time, she might find someone who will hit it off with you in a way that you can’t have with her. That will be the best for everyone involved.