How could she do that to me?

Reese has this girlfriend named Morgan, and Morgan really likes him. However, Reese still isn't over Kassie. Evidently when Kassie and Reese were going out, she promised that she would kiss him. She didn't get the chance because their relationship ended not too soon after it started. So, after a few weeks of not talking, Kassie and Reese said they wanted to be friends and hang out again. Reese brought up that Kassie hadn't kissed him like she'd promised. Kassie replied, well Morgan seems to be really important to you. "Nah," said Reese. "She's just a hump and dump." With that, Reese picked up Kassie and spun her around. Then he sat her on his lap and planted one right on her lips. Not only that, but she didn't stop him; knowing fully well that he had a girlfriend. That night, Reese gave Kassie the biggest hickey I've ever seen in my life. She proceeded in letting him talk her into smoking weed with him. That was something she'd always promised that she would never do . Worst thing that bothered me wasn't her disrespecting Morgan, or smoking weed. It was that when I asked her about the whole thing; she lied to me. We're best friends, and she didn't tell me. I had to find out from someone else. I think she's wrong, about everything. Also, I don't think she knows what she's getting herself into.