Am I crazy or is my boyfriend acting fishy?

Hello everyone👋 I just wanted to get your opinions on whether or not I have acted in a crazy manner or if my boyfriend is acting sketchy/fishy. So a little back ground story about me and my boyfriend is that we have been dating a little over a year now and are both college students. Anyways last week my computer died as I was right about to turn in an assignment. In the moment I could not find my computer charger and since he left his laptop at my house I decided to use it since it was charged. Often when he leaves his computer at my house, he lets me use it to pull up notes on the topic I am studying on both laptops. I then used his laptop to turn in my assignment. I saved the file on my laptop, which I can also pull up on my phone. I then airdropped from my phone to his laptop the assignment I was turning in. However, I noticed he had put locks on all his files. Meaning I was unable to open anything, his files, my file I airdropped, nor his photos. I then proceeded to email my assignment to his email and noticed that he had deleted his email off of his computer. Later this evening I diss used with him how I thought it was very odd of him to lock files and delete emails, when it has never been like that on his laptop. I also forgot to mention that I looked on his search history after using his laptop to turn in an assignment and noticed that he was searching how to keep his information on his laptop private and secured (Locked with passwords). After mentioning it to him he said he did not know how to lock it. I said I was not stupid and noticed his search history. He said I was acting crazy. I even showed him that the stuff is locked and he still says he Is unaware and unable to do that. So what do you guys think? Is there something he is possibly hiding? Maybe I am over thinking things.