No one slept in my roommate's upper bunk, so I put my electric razor on his upper bunk, and then once,

There are only two situations, either you didn't put it away, or he accidentally shook it down for you when he moved. Just kidding, I personally think that even if he accidentally shakes it down, there are factors that you haven't put away. ...

There is no way to solve this kind of thing anyway. You didn't witness the razor fall with your own eyes, and you don't know the specific reason. What else can you do? Think it's your roommate's fault? This kind of thing happens all the time. Don't take it too seriously.

You can infer whether your roommate is "lying" by combining his usual performance and personality, but it's useless. What if it really has nothing to do with him?

It's just a razor. Your roommate doesn't have to lie, and you don't have to take it too seriously. Just put some in next time. There is no need to struggle. Just let nature take its course and don't care too much, especially if you dig deep into this problem, it will only add to your congestion.

As for whether you are worried that your roommate is uncomfortable because you don't trust him, just saying, maybe you didn't put it away properly. It is also important to maintain the relationship between roommates.

I hope my answer is helpful to you.

Hope to adopt, thank you!