what should i do? drugs involved.

so a couple months ago, right before we went on vacation, a woman started working at the company my boyfriend and I work at. there was something off about her; I could tell right away. but I let it slide.

anyway, my boyfriend and I went on vacation. it was for our anniversary. I even brought lingerie. and so when my boyfriend told me he just wasn't "in the mood" I felt a little hurt because I had brought this lingerie and made myself  pretty only for him to shoot me down. but I let it slide.

then a couple weeks after we got back, I just happened to see my boyfriend's phone light up while he was in the bathroom. so I looked at it because we're quite open about our phones. and it was from her; the girl at work. and so I read through their texts and turns out she sold him some pain pills. which shocked and hurt me because he had told me when he was younger he had a problem with them but that he was over it and sober and such. so seeing that he bought pain pills from her was enough to make me really upset. But yet. I didn't say anything to him when he came back.

The next day, however, I decided to give him a chance to tell me himself. I just casually mentioned to him that me and another co-worker didn't like the woman because our other co-worker had actually worked with her at a different company and she was lazy and rude and just a bad person overall. He said nothing. Instead, later, when I checked him phone again, I saw that he deleted the texts.

So I looked up the pills he had bought and one of the noticable side effects of them were low to zero sex drive. Which my boyfriend suddenly had. Like we would have sex maybe one every three weeks. And as I mentioned, he couldn't even get it up for our anniversary.

That made me actually ask him about the texts and pills. And he instead told me he had bought them for a different co-worker who doesn't work the same shift as her. And I believed him because said co worker was a drug user so that didn't surprise me. And in fact, it relieved me to an extent. He even promised me he'd delete her number.

Anyway, the woman got laid off because she was on pain pills herself but didn't let our company know and after a work “accident” (it wasn't an accident. I'm almost positive she did it on purpose) she had to get drug tested and boom. She had dug herself into a hole. My coworker and I were very happy to see her go though. Lol.

But yet my boyfriend's sex drive just continued to go away till we went a couple months without having any sex. And I didn't think anything about it. Just felt like I was unwanted and unattractive lol. He tries to tell me his sex drive is just decreasing because of his age but he's not that old so I didn't  believe him. And started to not leave his phone anywhere near me.

Fast forward to a couple weeks ago and we're eating dinner and he pulls out his phone to show me something and a text pops up. From the woman. I couldn't read it but I got upset. And he suddenly went to the bathroom. When he came back and asked what was wrong, I told him and he pulled out his phone only to reveal there was no text. But I had seen it. And he instead got upset at me and wouldn't talk to me the rest of the evening. And I apologise for “mistaking it” and let it slide again. Nothing else happens.

And then last week while cleaning, I found an unlabeled pill bottle under our bed. Which I thought was weird because I clean daily and hadn't ever noticed it under there before. I asked him about it and he said it was probably to keep rocks in or something. I let it go but kept the pill bottle.

Then while we were at work one evening, I noticed he had an odd bulge in his front pocket. I made a dick joke and reached for it but he said it was his chapstick and he had to go help our coworker. But there was no way that it was chapstick. In fact, it resembled the pill bottle I had found earlier. When we went home that night, the mysterious bulge was gone.

Then again, while cleaning, I found ANOTHER unlabeled pill bottle. And it was definitely a new one because i still had the first one hidden away. I asked him about it again but he just ignored me.

So my question is, what do I do? He's clearly lying to me about something, right?. And I love this man with every ounce of my being but this has been hurting me. Our sex life is pretty much non existent, he won't leave his phone around me, he's up all night (not having sex with me. Hmph.), and he just isnt who he was months ago before this woman came to work with us. What should I do? Do I confront him again? Do I do nothing? Please help.