I am no expert to begin with but after much, actually a lot of reading. I don't think that his strain or any strain, if it is any different, can affect yours, which ultimately it is the same, only he or his body or him not taking medication let it grow stronger but there still will be an equillibrium that your body can handle. Your VL may increase but then level out but if your on meds, you may see no difference.
I guess my point is... what counts is how each body (your a body with a fairly strong immune system on meds, he is a body without or a declining immune system) , responds to such. Yours should depress it. But your VL may increase some. Some people, with medication can resist higher viral loads as well so there may be no differnce,
Again that's from what I have read and I'm just me. Not a doctor.