Why do girls flirt with guys that are taken?

Me and my boyfriend have been together for 4 years and we go to this local bar 3-4 times a week to play poker and there are these girls that flirt with him and make it very obvious to me. I can give you some examples: He'll be playing at a different table than me they will be giving him the I wanna Fu%$ you glare while talking to him and laughing and such and then while doing this glancing over at me with this look like HA! HA! knowing I'm watching. They have little pet names for him, I have seen them pinch his love handles, go up to him put their arm around him then start jumping up and down in a low cut top shaking their t*ts, one women while me and him were sitting at a table he was sitting with his chair turned around so his chest on the back of the chair and his butt hanging over the edge of it and this woman took a chair put it directly behind him sat down opened her legs and started rubbing his lower back while looking at me and squinting her eyes like "what are you gonna do about it?' I ask my boyfriend why would you let somebody disrespect me like that why don't you tell them to stop, when you don't want attention from me you can tell me to stop? I tell him about the looks they are giving me while doing these things and he tells me I didn't see that or I'm not flirting back with her. I ask him why doesn't he want to touch me in public and he say's he's not a big fan of PDA it makes people around feel uncomfortable in the past 4 months we've been going there he has put his arm around me about 6 times he rarely ever gives me a peck on the lips. I feel like he sticks up for their behavior whenever I say something about it it turns into an argument sometimes while were there and they see it. And of course once again their giving me the HA! HA! look. If I go to touch him or kiss him he looks uncomfortable but when they are doing it he doesn't he say's while talking to them he doesn't notice the looks they are giving him or me. I am ur girlfriend and I am telling you the looks they are giving to me and you why does it matter if you saw them or not? Their actions around you speaks for itself. Why are they doing this? And why does he not understand what's going on? He doesn't seem to think women play these games.
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Please give me some advice.
Why do girls flirt with guys that are taken?
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