My girlfriend cheated on me with my dad?

My girlfriend and dad had sex three times and felt so bad they told me.
We have been together for over a year. My girlfriend and father last week set me down to tell me they had a week long affair a couple months ago. They only had sex three times they said, and after the third time they say they both felt extremely guilty and mortified at their actions. They've been wanting to tell me since then but didn't have the hearts. I always knew they got on well, they bonded over many shared interests, but I never saw this coming. I feel completely sick. I haven't eaten hardly anything since they told me. I haven't officially broken up with her yet, but it is obvious as I haven't responded to any of the texts/calls she's sent. When they first told me and after it had sank in, I left and haven't said a word to anyone outside of work since. I've been a total ghost to my whole family and friend group. My dad and I are very close. For my whole life I have looked up to him. He and my mom divorced when I was a teenager but they have been very friendly to each other which made the process so much easier. I want to forgive my dad. But if my girlfriend had cheated on me with another person, I would easily cut them both off. And in a weird way my dad has hurt me so much more by doing this than she has. I could get over a cheating girlfriend. But my relationship with my father, a relationship I cherished, is destroyed. And it's his fault. My question is this: Should I forgive my father? How can I forgive him? Should I tell my mom or brother? Would I be CRUEL for completely cutting him off which is what my heart it telling me to do?
+1 y
P. S


+1 y
My dad began to tell me about the affair

At first I didn't even really understand what the hell they were saying but when my girlfriend started crying and my dad looked serious and put his arm on her shoulder to comfort her the reality hit me. I wasn't able to ask any coherent questions I was just in shock, but he said he loved me or something and that even though they messed up I should forgive
My girlfriend cheated on me with my dad?
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