How do I gently discourage my friend away from this guy who doesn’t like her?

Anonymous
So my friend, T, is lovely and fun and amazing, but she’s liked this guy for a while now. This guy is one of my friends, and he has a girlfriend. Not to be horrible but he clearly isn't interested in my friend back, he told me he doesn’t remember her name or really know who she is. And he just clearly isn’t interested.
I want to be a good friend and not encourage T to be so invested in a guy who’s taken and not interested because there are loads of other great guys out there, but I don’t know how to do it without hurting her feelings.

She keeps making things up, like “his girlfriend clearly sees me as a threat”, “he spoke to me so he must be interested.” Like he speaks to everyone and again he has a girlfriend he’s really into and I don’t think he’s interested in my friend but she keeps claiming he is when he shows no signs of it. And his girlfriend never spoke to any of us I don’t think she sees other girls as threats.

I don’t want T to get hurt, she keeps seeing things that aren’t there and he’s told me himself he barely knows her. I haven’t told her that as it would hurt her feelings. How do I lead her away from him nicely?
How do I gently discourage my friend away from this guy who doesn’t like her?
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