<human>: So my boyfriend has a friend who is in a few of his classes, and I've met her a few times, but I'm not a huge fan of her. 

I don't dislike her simply because she is his friend, but because she cheated on my best friend (16F) twice. She is known for messing with relationships, and has admitted several times that she quite likes my boyfriend. 

I don't mind that he is friends with her. I personally dislike her, but that is no reason for me to have him end a friendship. It just makes me nervous that he is close to someone known to screw with things for her own gain. 

I have expressed my feelings about this to my boyfriend, including how she put my best friend through some really terrible things,but he claims that "It's in the past and we should just get over it. She's not that bad." 

Within the past few months, I have received messages and Snapchats of him that she has sent me, and they are often photos of him that he is not aware about. 

The most recent time, I brought it up with him later that day, and how it makes me uncomfortable that she is always talking pictures of him. He responded saying that he knows about some of the photos, and he doesn't mind that she is sending them. 

It wouldn't bother me if it was anyone else, but the fact that this girl has done things that have had detrimental effects on people close to me makes me nervous. 

Am I paranoid? I don't know how to get my point across that her doing this makes me uncomfortable.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: friend of my boyfriend who is known for causing trouble keeps sending me photos of him, and I don't know how to address the situation without seeming like overprotective and jealous.