Was it justified?

Since mom left us Dad and i have lived together and it was all great. He has always been caring and gave me freedom to pursue anything i wanted. Last week though everything turned on its head. A male friend and colleague of dad from work came home for dinner and stayed back. I retired to my room as i had work myself next day. I do have a habit of going to have water sometime at night and while doing so caught dad his friend being intimate in the living. I stood blank and they were trying to say something and all but my ears and eyes and everything seemed like it didn't work. Since then we are having tensions though he has talked with me many times and even took me out. i dont know how to handle seeing that. Is my reaction justified? Pleaee dont ask me details here.. feel free to message. I am not comfortable discussing details here !
Was it justified?
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