Is she a good friend or NOT?

Kay I have a friend who is just like that and sorry boys but a girls pov is way diff then a guys I agree that she isn't the best of friends but some girls just flirt with any guy within a 5 foot radius my opinion is don't ditch her or the boy instead you make it a bit weird when she flirts so when she grabs his but say "hahhaha someone wants (guys name)" just little things that make it TOTALLY obvious of her flirting and trust me unless he wants it or she doesn't care it will stop and you also need to find out if he likes her because if he starts getting a crush on her then your in trouble that happened to me and it hurt so bad

It's happened to me recently, and no, they're not a good friend.

You have three options, you can either tell her where to shove it, tell them you don't care, and that whatever happens happens or tell her that if she values your friendship she'll stop it. The second one is the moral high ground, but play it however you like.

Your friend is feeling threatened by you. Subconsciously she is afraid of having any attention that could be paid to her, paid to you if you were to have success with this guy. And she may start to feel that if you were to spend time with this guy, that you may inadvertently end up spending less time with her as a result. Basically she wants all of the attention in one way or another. This doesn't necessarily make her a lost cause as a friend. She simply is still young and somewhat immature. Everyone's been there. As for you, stand up for what - or whom - you like. Don't let her jealously push you around, but at the same time, be a good friend to her even if she has issues with you and treat her with as much respect as you can.

You do not need a new crush. Just a new friend. I had an incident where my best friend had a boyfriend. At my Christmas party I pointed out a guy I didn't know but thought was cute and expressed my interest in him. 5 minutes later she is sitting on his lap making out with him in my living room, my kitchen, and in the bathroom. Friends don't do that too each other. She obviously lacks a great deal of respect for you and your feelings. ESPECIALLY after you confronted her. She's not in kindergarten and stupidity or lack of brain cells is no excuse to disregard how you feel. And if you get a vibe like your crush might be interested in you then make a move. Good luck.