A guy I used to casually date said I can shag if I want in the middle of a text convo about something else entirely?

I wouldn't mind but it would probably never evolve into a real relationship, just some sort of friends with benefits thing. This guy was my roomie for the better part of last year, but he never indicated he was interested. My question is, why would someone text this in the middle of a convo about something else and why wouldn't he have told me this in person? I'm confused!

A guy I used to casually date said I can shag if I want in the middle of a text convo about something else entirely?
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