Why was he offended?

A guy that I used to talk to for 4 years on and off hit me up the other day asking what I did for valentines day so I told him I was with the guy I’m seeing even though the guy I used to talk to has a girlfriend. Today we were joking around and he said ‘smd’ as in suck my dick so I said no then he said yes so I asked him if he’s not with his girlfriend and he said he is and why? Then I told him not to talk like that to me when he has a girlfriend and he said it’s a figure of speech and said that was weird and said he’s out the chat. I didn’t mean to offend him but how else was I meant to take it? Why would he react that way?

Why was he offended?
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