Mason bore a grudge towards Zoe. So, he wasn’t exactly eager to spend time with Zoe after he came back from Hucksburgh.
On the other hand, she stayed out of his way whenever he came over to hang out with Yanni. At first, he found it distasteful. However, he paused and thought that she loved Farley now. Any and all sexual relationship she had with him was just so she could get pregnant with his baby.
It had nothing to do with love.
The more he thought about it, the more he kept a distance fr