I(F25) come from a somewhat conservative household from Asia. My parents are not aware of my personal life and I don't necessarily tell them anything about it either.

So recently, I traveled to US to give an exam and my dad's friend from college offered to host me for a week.

Now, this friend(M57) and my dad attended same college for 4 years back in Asia and he moved to US in the 90s, got married to a girl from home and has 2 adult sons, successful, owns some million dollars home, so and so. He has a lot to lose. He visits our country atleast once a year and always makes sure to visit us, so I kinda knew him childhood. A year ago, when he was visiting, I told him about the upcoming exam and since it was in the same state and closer to his place, he offered to host me.

When I showed up, both of his sons had moved out, so I was using one of his sons' room. His wife works in healthcare so she was rarely home (for the 1 week I stayed, I saw her may be 5 times) so it was just me and him most of the time. Nothing was planned. We never had any sort of feeling for each other than a (and it makes me sick in my stomach saying this) father -daughterly relationship, never exchanged sneaky glances, nothing. After my exam got over, I asked him to take me to a bar (my dad doesn't know I drink and he agreed to not tell him) and we ubered home. I was not drunk and he wasn't either, both tipsy at the best and I'm not going to blame my actions on alcohol, but one lead to another and we ended up sleeping together. It was a conscious decision on both of our part but against my better judgment, I went with whatever I was thinking at that time. After, he kinda just stood up and left. And the next time we were alone, I told him I want nothing to come out of it, I won't tell anyone and asked him to do the same and to forget this ever happened and just move on.

For the rest of my stay, I cried almost everytime I was alone, puked once or twice. I feel so bad, especially for doing this to his wife and kids who were kind enough to let me stay at their place for free. I feel bad for betraying my parents who trusted me enough to go stay with a man who was like family to them. I am angry at myself and at him. it's been 3 weeks now and I still can't function normally. My friends know something is wrong with me, but I'll throw myself from a building top before telling anyone I know about this. I'm also scared that he might feel guilty and tell his wife and the news will eventually make it back to my dad. He'll disown me. if I could go back, I would not do it again. I don't know how to move forward from here. My mental health is declining and I'm having some intrusive thoughts about this.

how should I move forward in this situation?

tl;dr I(25F) slept with my dad's married friend (57M) from college living in US while I was there. I feel like shit. I know I'm at fault but I don't how to move forward or find a solution for this.