It must be so difficult for you right now. I am sorry you are having to go through the worry and concern you have.
There are a few things I can say that I hope will help you feel better.
Over 20% of men in North America have seen professional sex workers at one time or another in their life. This is not an uncommon thing.
The fact (if indeed it is really true that it's a fact) that your dad is seeing escorts means a few things that are actually good.
1- he still wants his marriage.
2- he is still healthy enough to want sex
3- he is trying to be discreet so as not to hurt your mother
4- he may be doing this because his wife, your mom, doesn't want to do some of the things he feels he really wants to experience.
5- he does NOT want a love relationship with someone else! He just wants something he can't get in his marriage, but still wants the marriage.
6- the fact he seeks a professional means he is not spending extra time and money wooing a girlfriend who could destroy his marriage.
You really should not know this much about your dad, but I think that realistically, if you cannot reconcile this within yourself and will harbour resentment towards him, you must sit your dad down, unemotionally, and tell him what you know. You need answers from him as to why this is happening, otherwise you will think the absolute worst. I am guessing it is not as bad as you think it is.
Do NOT tell your mother. This is something your dad may decide to do on his own, but it is his marriage and his business, not yours!! If you love having your parents together, you should STFU.
30-60% of people cheat in relationships. This is just a fact. Many cheaters love their partners but cannot deny the thrill of the chase or an activity they yearn for. The idea of fidelity is a romantic notion that I really like and ascribe to for myself, but it is unrealistic for many people.
if my husband was stepping out on me and someone I loved knew and didn't tell me, I would feel doubly betrayed. Somebody would have hell to pay. It's a tough call. You know your father and mother better than any of us do.
Thanks for you thoughtful reply, I certainly have been in shambles I tried to ignore it for a couple of weeks hoping it would disappear and I would forget but every time I look at my parents I think of this. I am booking an appointment to speak to a psychologist tomorrow I can't run from this much longer, its eating me up inside.
I realize that people get bored in relationships and see the temptation to stray, what angers me is that my dad has always carried himself as this morally superior man and to see him abusing women by buying sex infuriates me, more so had he just been cheating. Its that act of buying sex that I can't look past, and maybe I am naive and have a narrow world view but men who buy sex are disgusting they prey on women, even if they buy it from a high end escort.
I just don't know yet. I have gathered some more evidence that it is him and depending on what the psychologist says I might sit down one day soon and confront him on what I have found and really talk with him, adult to adult.