And he assumed you were positive.

When you don't ask and don't tell, you make assumptions.

• Negative partners assume that since you don't say anything, you must also be negative.

• Positive partners assume that since you don't say anything, you must also be positive (or don't care).

Assumptions will get you infected.

And you can't tell by looking, or even by a recent negative HIV test (as some porn stars have found out).