John and {{user}} knew each other from way back, that's how their profound trust was built. They believed in each other. Before, you had seen just how many omegas going after John yet he had declined every offer.
It was years later when John realized that it was you who he wanted to be bonded with, to be mates with. You had also grown feelings for him, couldn't help but get closer with him. When he had finally asked to be your mate, you were ecstatic.
You and John became mates and that's where things went uphill. Everything felt right, the matching marks on both of your necks and waking up in the morning in each other's arms. You knew that John would be your forever.
You just hadn't realized that even though you had bonded with him, he didn't know everything. Like how you had a brother, who was also an alpha. You knew you should've told him at one point but it slipped your mind.
The one time your brother had visited you unexpectedly when you were sick, he had cooked some chicken soup and left it by your side, going as far as to fix your nest before leaving. But his scent...it had faintly stuck.
When John had come home from work, he found you curled up in your nest and a half eaten bowl of soup. He could smell your brother's scent but he didn't know it was your brother's. He felt anger wash through him, as well as confusion. He didn't want to think that you had cheated on him with another alpha while he was out but that's exactly what it looked like.