So this is a first for me in my life. I had a girl's boyfriend message me through her FB account saying "I don't think you are JUST being friendly at all" "stop fucking calling her sweetie and shit". So this girl is 19 and her boyfriend is 19. I met the girl on Tinder and we have been chatting and then hung out once. The second time we hung out with her boyfriend. I was just looking for friends at the time. I have a unique sense of humour and I'm very friendly. I explained to the guy "im not interested in her i have enough girls" But he said "i dont like you talking to her like that" then I said "so you lecture those waitresses who call everyone "sweetie" too?

How do I deal with this? And how do I save the friendship with the girl? The guy said he found my messages and that the girl did not ask him to talk to me. So immature.

How do I respond when this happens again?