"Samantha!" she squealed, beaming. It was the first time her smile had directly met her eyes since I'd first met her and I knew why.

She was gloating. She was gloating because of what she had done with David at that party. I'd only turned up to surprise him yet it turned out to be HIM surprising ME! I'd walked into that room completely innocent only to find him with his tongue in her mouth and his arms wrapped tight around her. Hardly the romantic weekend I'd envisaged.

I don't remember much after that, but I remember running from the apartment that the party took place in. I remember tripping down the last flight of stairs and settling down on the bottom step to cry. I remember David putting his arms around me and me hitting him away……after that it's a blank but I heard about me spending the night crying into my phone to Lucy in a hotel room before taking the first flight home. David followed me, of course.

He turned up about two hours after I arrived home with tears in his eyes and regret in his heart. He spent over three weeks sleeping on my couch, talking to me everyday to convince me it was an accident and that Katie meant nothing to him. He said some really cute stuff about me being the only one that matters to him and he couldn't live without me, and how I meant so much to him that sometimes he felt that he loved me too much!

After that, I had become almost needy, terrified that he would break my heart again, just when I'd started putting them back together. But I knew that he hadn't - I don't know how, but I just felt in the pit of my tummy that he hadn't kissed her or any other girls while he'd been away. Admittedly, the fact that he called me pretty much every night was very reassuring. A guy can't have an affair if he spends his life on the phone to his girlfriend, can he?

Yet now when I saw her again, I felt the nerves and anger rise again in the pit of my stomach. She certainly had a knack for making me feel scared and uncertain.

Now, she walked into the apartment uninvited, giving me a quick hug, thought she did try to keep as much of her body away from me as physically possible.

As soon as she had entered the room, though, she swooped down on David, giving him a small hug and a lingering kiss, smiling sweetly as she did so. She gushed happily about how amazing his new apartment looked and how he could have so many parties here with his redecoration. She smiled happily about how she knew she had left this place in capable hands when she had suggested him renting it,

I settled myself on the other side of David, putting my arms around his waist. "It's brilliant, isn't it?" I squealed. "it's a perfect love nest for us - really romantic."

She smiled frostily at me and made idle chit-chat for the next hour. She looked as though she didn't want to leave, but after I put my head in the crook of David's neck and whispered suggestively in his ear, she began to look uncomfortable. Well, to be honest, I whispered for him to get rid of her, but the way one hand was playing with his shirt button while the other twirled sections of his hair, it certainly LOOKED suggestive.

When she did get up and leave (kissing David beforehand, though, and I swear she tried to slip him the tongue), my boyfriend looked relieved. He glanced at me worriedly but relaxed when he saw the satisfied expression on my face.

I probably should have been more annoyed but the expression on her face when David and I kissed in front of her was almost worth the humiliation of her turning up tonight.

So I just kissed David and pulled him into the bedroom. He grinned, as he kissed me harder and deeper, pushing me onto the bed.

That night I woke up and lazily turned to David to put my hand on his chest and cuddle into him. But instead of finding my nineteen-year-old boyfriend, the bed was bare.

David was gone.