SO talking to girl best friend about sex

So my SO was vaping in the living room because he knows I don't like vaping in our bedroom. While he's in the living room I hear him talking loud. I go and sort of spy on him and he's talking on video chat to this girl is super close with and they're talking about sex. She's bisexual and has a girlfriend. She was telling my boyfriend about how her girlfriend always wants her to go down on her but she never wants to reciprocate and whenever it's time for her to get off she says she's tired. My boyfriend had said "You got a pillow princess on your hands". She asked what a pillow princess is and he said "Basically someone who wants you to get them off and when its your turn to get off it's pretty much fuck you, except no fucking". She asked what she should do and he said "Tell her she's not getting off unless you both are getting off and stick to it". She starts laughing and shit and she said "I'll try that but she will probably bitch". And he's like "Well if she bitches about getting you off, leave her and go find another chick who will get you off". After that they start talking about some club she hasn't been to in a while and she would pick up girls from there. I feel like I may be overreacting being upset about that conversation. It seems like it was nothing sexual between them to but should I be worried?