Girls, Is spending hours alone, biting, and touching other men acceptable when in a relationship?

So I've been seeing a girl for a couple months. And things were fine. Until one day she told me she was invited by a guy friend to hang out. She said she was going for an hour. And I said that's fine and we were planning to hang out after. Then 1 hour turned into 2,3, then 4. I got a little suspicious. So I told her I don't know if I want to continue the relationship, and usually if I spend that amount of time alone with a women I have more intentions than just friends. And it took her until the next day to explain which was odd aswell. But I digressed. Then days after, while she was showing me videos, I see a video of her biting down on some guys arm. She says " that's my friend, I bite all my friends" which made me uncomfortable. And a couple days ago, I went with her to her gay friends party. And she starts touching and massaging him at the dinner table. Then she goes over to his boyfriend, and starts touching and kinda flirting with him. I pretty sure the other boyfriend was getting jealous aswell. So I confronted her, and we got into an argument. She ended up just saying " this is who I am". Now I'm honestly open to being wrong but I don't think this is ok while in a relationship. I think it would only lead to serious problems in the future. And I'm not a controlling person either but i don't bite, massage, or get touchy with any female friends I have.
Girls, Is spending hours alone, biting, and touching other men acceptable when in a relationship?
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