Workplace diplomacy

The things I cannot say because I work at my desk five feet from you at your desk: I know that it could be my fault as easily as it could have been your careless mistake, but I can't stand to see you. I can't see you walking in the door, I can't see you in the corridor, I can't bear for you to ask me a question in the office because I know I must answer you so as not to arouse suspicion but the only thing I can think to respond is the petty thing, the You told me via text you might have given me an STI, and that's certainly not diplomatic.