<human>: Since quite some time I knew that my parents had problems in the bedroom. About 6 years ago I overheard -very involuntarily- my parents arguing about this. I guess my dad was unsatisfied and wanted to have sex at least once a month, but my mum said she is too stressed out. She "suggested" he should just get on top of her when he needs it and she would lay there and let him. My mum is pretty agressive in arguments and always "wins" them.

Also my mum got her uterus (?) removed a few years ago and I think she hasn't really got a sex drive anymore.

In general my parents are fighting often, mostly at weekends or vacations. My mum's also threathening to divorce about once a year. Or probably more often, I just hear her saying that she wants a divorce about once a year. Thankfully I'm off to College since half a year and don't have to hear them fighting so often anymore.

Well now I was home over the weekend and today I heard my mum bring up my dad cheating in a fight they had about something different. I don't think they know I heard.

So what shall I do know? I wish I could just unhear it. I always knew they had lots of issues but it didn't seem that bad most of the time.

I don't like my dad less now, I guess I can understand why he did it and with me it wouldn't be an issue if he cheated and my mum just never found out about it. But I also feel lots of pity for my mum, because it must feel unbelievably shitty for her. 

I know I can't fix anthing for them and these aren't my issues. I just don't know how to handle knowing this now. I don't want to be wondering how long this has been going on and how often and all this shit. Have some of you already been in the same situation? Can someone give some advice on how I can deal with knowing this? I don't want to look back later and realise that this event caused trust issues or something similiar.

Give me a shortened version of the text
<bot>: Overheard that my dad cheated on my mum, I don't know more, I wish I just unheard it, but am left wondering about it all the time.