Am I wrong or crazy?

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My boyfriends best friends name is Tim. Tim fucked this girl Jennifer a few times while his girl is knocked up in rehab. (Classy, I know. I don't like Tim) SO this girl Jennifer starts messaging my bf on Facebook then they start texting. Idk what was said at all. No clue. He then tells me she's coming over. I asked why and he said "she's upset about Tim and she's gonna smoke with me." Idk why but this pissed me off to NO END that he invited some girl he barely knows over. Am I wrong for being mad or is he right and I'm overreacting? 
PS my bf told me that he wouldn't fuck her because Tim still has feelings for her. (Note he didn't say because HE HAS A GF)

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