I think my mom is cheating on my dad

Okay, so I don't even know where to start this. Last month I was on my moms phone because my cousins wanted to talk to me or something and after that I started snooping around (yeah I know) anyway I found somehow I stumbled across whatsapp messages from some guy (lets call him N) who's her colleague and they were saying really romantic and sexual stuff. Not only that, both my mom and N are married. That's not all. Last week my school was off because we had really heavy rains and the roads were flooding and stuff. The hospital she works at is way closer than my house and I didn't have an umbrella and so I came there completely soaked. I walked into her room/stall thing (the staff sort of knows me so they let me). There a small glass on the door and I saw that she was SMOOCHING that exact same guy. Since she could only see my torso from the window, I decided to make a run for it and I came in some minutes later when he left and pretended that I didn't see anything. She didn't see me at all so I think I'm safe. Also I decided to check her phone once more and he said something like "after meeting you I'm so touch and sexstarved and it hurts that I can't marry you" (not verbatim). When I told this to my brother (I trust him with my life, I don't think he'll tell anyone) he also told me that one time when mom had to drop him over somewhere the guy was sitting in her car and she told him he was a school friend, that was around 3 months ago. I'm not planning to break this to my dad anytime soon. But I don't know what else to do either. I know this is all a series of bad decisions but I'm kind of worried. PS: I'm 16 and pretty close to her and my dad both.

Wow, that has to be so hard to consume all this from your mom. I think that it is tough to break your Dad heart but I also think that he shoud not feel like everything is okay when in all reality it is not at all... He is getting hurt and each day he does not know is another day that is another day that he should not have to endure another day of being cheated on and lied to. I think you and your brother should sit down with your Dad and talk to him. One way or another I think he is going to find out and It might be best for him to find out about this with you and your brother there for him than seeing something unexpected on her phone or in a room or something. I am so sorry that you are encountering this matter and I am sure it is very emotionally and physically draining. Well, I don't want to write too much because I don't want to overwhelm you with this but I hope this does help. I really really hope to hear back from you soon!!! Stay Strong and Hang in There !!!! Ps: Love Your Username hahahah

Not planning on telling your dad anytime soon? Maybe waiting until after the holidays might be best. However consider confronting your mom about this now. There might undoubtedly be some drama, but your her son. It's only fair that you get an explanation too