I found my mom(43) is a hotwife

I am boy(21). My dad (47) is a cuckold husband and my mom (43) is a hotwife. I found they are in lifestyle since from 7 years. once in summer one day my football match gets cancelled so i returned back eary at my home. Front door was locked but some music sound was comming out side. So i decided to go inside through the backdoor. When i entered from the backdoor i was searching why music is on. When i reach to the bedroom. Bedroom door was not closes properly so i was peeping inside. I got frozen and totally shocked. My mom was making out with dad's office friend and dad was sitting on chair watching them. They all work in same office since from 15 years. I never expected such things from them. It was totally heart breaking and traumstizing for me. I dont know why and from how long they are doing this.. Although their dark secret hurted me so much but no matter what, i love them so much.