Just found out my boyfriend is taking pills for sex drive....

Hi ladies, so I’m kind of embarrassed to even say this.... but a few months ago, my boyfriend and I got into a huge argument about how we were not having sex like we use to. I’m 23 and he is 30. He does smoke marijuana everyday and he works a lot and is usually very tired. & I have thought that plays such a huge factor. So today, I was cleaning up, and inside the cabinet, way up top above the kitchen sink I found 2 empty bottles of testosterone pills, and a package from last month where he ordered new pills for sex drive..... I’m just confused, it makes me feel like there is something wrong with me as to why he is taking these pills. Also, why has he not talked to me about this, wouldn’t you think this is something we should discuss? I completely understand that it may be a sensitive issue, but idk how to feel ladies. & I don’t want to just bring it up to him, because it’s a reason I never knew about the pills.... I just need a little advice, how should I feel, should I be upset? 😞