Girl's Behavior

Two girls are fighting over me?

Hi, so there are two girls fighting over me. One of them is my good friend and another is this girl in one of my classes, which my friend is in. My friend knows I like her and she feels the same way. The other girl seems to act like she likes me. So whenever this girl and I talk my friend will come over and get really affectionate and will hug me and kiss me and say "I love you." Then when she leaves the girl will make fun of how I like my friend. And my friend will become really sad when I sit with this girl, but she never really talks to me unlike this girl so I sit with her. Then today the girl was teasing me for liking my friend and I asked if there was anything wrong with it and she got up and said she had a change of feelings; and made comments about how we all have our first love. But anyways I feel like they're passive aggressively fighting, which I don't get because my friend knows I like her, this girl just makes me loose and less serious. And on top of that I've never seen my friend insecure in our entire friendship so this doesn't make sense, what do I do?
Two girls are fighting over me?
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