So unlike most posts here ill just get to the point.

I'm a 18 year old senior. I was hanging out with a girl and her friend. I brought two of my friends and we all hung out at the park.

I didn't know the girl she brought so I spent some time talking to her while the other girl talked to my friends that she didn't know.

After we all went home the girl I already knew texted me and was pissed because I was flirting with her friend. I "lead girls on". I have made it clear to her I don't want a relationship with anyone so I don't get her deal.

I am pretty popular at school and have been told that I "flirt with every girl in the school". Which Is pretty true.

Anyways, how can I keep girls from thinking I "like them" and "leading them on"? Keep in mind I make it clear that I don't want a relationship to pretty much everyone.