How to tell my advisor I stopped sending him weekly reports on my results because he was not answering my emails?
I would say that, like others, you should tell him honestly.
Something to the effect of:

&quot;My apologies for the lack of communication in the past few weeks. I was under the false impression that you only desired my reports in urgent cases, as there were several that you did not reply to. It was my mistake to make that supposition without explicitly asking you. In the future, I very much would like to continue working from home but I also would like to find the best way for both of us to communicate. We can certainly continue a report every two weeks but, in that case, it would be very helpful to me if you would be able to offer me a little bit of feedback for the report. I understand how busy your schedule is but I would truly appreciate it. Please let me know your thoughts.
Thanks,
[Your name]&quot;