My father is constantly having affairs even though hes married to my mom what should i do?

i found some cards and pictures of him with his girlfriend…….. and i constantly see his emails/ texts to other women he is involved with so many girls and everytime i think about it it gets me distracted and i feel really sad.. is that unusual? i have never told anyone… i think my sister knows to but not as much as i know.. he took one girl to europe, florida and on multiple weekend getaways. he even bought her a car and in a letter she thanked him for providing her with stability so she could finance her new apartment… what does that mean? how much money would that have been? i really dont know what to do… sometiems i think about telling him when hes mad at me but i dont want to destroy our relationshipp………. help

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