When you got to Harry's flat that day, you ended up confessing to him what happened between you and Luke and sincerely apologized to him for it. You also told him you needed some time to yourself to think through it all.
A couple of weeks later, you made your decision. While all of the members of One Direction and 5SOS were now at Zayn's flat you, Harry, and Luke all met up in a separate room and you talked to them about your decision.
"Harry...Luke... You two are seriously two of the sweetest, selfless, and most romantic guys I've ever known. I don't even really know what else to say without being overbearing so I'm just going to tell you my decision, which was one of the hardest I've ever had to make..."
You paused for a moment to observe how the intense look on their faces made you worry that either one of them would suffer from an aneurysm at any moment.
"I've decided that Niall is actually the right one for me."
Luke and Harry both looked at you with blank, slightly angry faces.
"Niall?!!" Harry asked.
"Yeah.. See, when I was so torn between you two Niall comforted me as I cried and at some point during those long, endless nights of him sitting up with me as I cried, we fell for each other."
With both of the boys still staring at you in shock you just smiled and said,
"I'll just let it sink in for you... I really hope this doesn't affect our friendships because I do still genuinely care for you both as a friend."
You kissed them both on the tops of their heads before you left the room to go sit in Niall's lap in the living room with the others.
As Harry and Luke sat there in the silence, Harry turned to look at Luke and said,
"You know, if she had picked you I was fully prepared to kill you."
With puppy dog eyes, Luke slowly looked over at Harry.
Harry just smiled and patted Luke on the back and said,
"But she didn't so you're okay."