is it normal my best friend hits on me and i ignore it?

My best friend is a guy, and I'm a girl. I have a boyfriend I've been with for years that I'm going to marry in the not so distant future, and I love him with no doubt in my heart. My best friend has a girlfriend hes had a while. But if we're just hanging out, he will hit on me, a lot, and make a point of it. He'll touch my arms and find excuses to put his arm around my shoulder, he'll call me "his ginger" and point out hey did I notice he said HIS and be pretty much all over me. Sometimes. Sometimes he's just normal which is why he's still my friend. And I snap at him for flirting all the time. But mostly I ignore it. He'll say something about how movie theaters are dark and I kinda just roll my eyes. I know he's doing it but, he's my best friend. I think if I say something he will get upset and go, or if I say something to my other friends they'll think I'm a whore.he never does it in front of others in our group so I kinda try to keep it back. I don't flirt back, I don't blush or giggle like a school girl because I really am un- phased by it but he will joke about really serious things and then act super platonic around everyone and seems genuinely good to his girlfriend. So, is it normal to ignore it and let him? I don't feel like ignoring it is cheating on my boyfriend but does anyone else see it as cheating?