What if you found out that your father is gay?

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My bestfriend and I, accidentally found out that his father is gay, and the worst of all is that our close friend is his lover. We were attending a shower party for our friend who's soon to be married in one of the sleazy motels,on our way out, we saw his dad's car, suspecting something, we followed the car. This was at 3AM, by the way. We were wondering the direction he was going was to the house of our guy friend. We thought his other woman lives near our friend's house. We were confused all the more when the car stopped in front of our friend's house, and our guy friend got off the car. He went around to the driver's seat and, we saw in our eyes. . . they french kissed. We both was so shocked. My bestfriend was devastated. To make things even worst, my bestfriend is in love with our guy friend. What do you think should my bestfriend do?