Is it normal i don't know what to do?

I recently found out someone lied to me. At the begining I was so surprised I didn't had too much reaction to it, more like a "Are you fucking kidding me?" kind of reaction. But then sadness and disappointment kicked in, and now I feel horrible. I feel like everything they said to me was a lie, to the point it made me cry several times. I can't deny that I'm hurt. I know I can go and tell this person how I feel but I don't want to, I want to keep my feelings to myself and move on. Here is the problem, there's a little voice in my head asking me repeatedly "What are you going to do about this?" This goes on for hours non-stop. It's driving me fucking insane. It'll shut up for a little while, then it comes right back again. I want to make it stop. Like I said, I don't want to do anything other than moving on and forget all this happened. This voice in my head is making me feel like I should do something about it rather than simply moving on. I've never experienced something like this before. The more this voice asks me, the more I think about it. Maybe I should do something, but I don't really want to. I don't know what this voice wants me to do, and honestly, I don't want to know either. It's like I want to make myself do something agaisnt my own will. I don't know what to do. I have no idea what this is. I just want to move on. Am I going crazy? Should I listen to the voice in my head? Have you ever been through something like this? This is normal?