Friend followed my man on social media, am I overreacting?

Anonymous
Am I tripping over this? My 'friend'/roommate has a history of flirting with the men I date or am interested in, but when I confront her claims she has 'no idea what I'm talking about.' She got into a relationship with a man I was talking to last year, talked to him behind my back and rubbed it in my face that she "stole" him from me, showing me the texts between them and laughing. I forgave her eventually because I thought it was a one-off and they really liked each other, but I moved on and started talking to a new man. She asked me to send her pics of my man because she said she was 'rooting for me.' She then proceeds to tell me how "hot" he is and said "Don't worry I won't steal your man again JOKE." I told her she can't go after the same man as me again and warned her, and she said she was 'just joking' and not to trip because she's in a relationship and he's 'not her type anyway.'

But now I noticed she's added my new man on social media, been posting thirst traps and has been liking his pics as soon as he posts them- even though she's 'in love' with her current boyfriend. I asked her about this and she said "what's wrong with me adding him on social media?' making me out to be the crazy one when she doesn't know him and has never met him. She said she'd added him so "she can have something to talk about when she meets him through me." Am I overreacting or is she a snake?
Friend followed my man on social media, am I overreacting?
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