This is about a girl I know. She gets jealous when I'm interacting with other girls when tho we are not together. Once when we went out, I was about to kiss another girl, she gives me a very bad look as if I have done something very wrong, then turn to her and scream at her that he is mine. or the other evening we were sitting next to each other and I was texting another girl. she said something like "I hoping you are texting a colleague" I told her no I'm texting another girl. then she got very upset and left the room. So why would you think she is getting so jealous when I'm interacting with another girl ?