Is this a red flag in a guy?

My crush and I just started talking and we don't really know much about each other and I kind of feel we are moving too fast. We got a bit too flirty, this is the second time we are talking and I don't know if he likes me or not. He has a girl best friend who I like talking to but the problem is that she gets to touchy and clingy when I'm with him. What do I do? I getting bad feelings about this

Is this a red flag in a guy?
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