What if during season five when Derek was having his break down over the death of Jen , the pregnant tumour patient , did Derek cheat on Meredith?

Disclaimer: I do not own Grey's anatomy.

Derek awoke due to the painful thumping in his head that felt as though there were little men inside his head banging in his skull with hammers. As he opened his eyes he was confronted with the face of a young naked brunette soundly sleeping beside him. Derek pulled the sheets of his bed up to look down at his body only to discover that he too was naked. This is bad. This is very, very bad.

Derek slowly withdrew the sheets from himself and rose to his feet only to stand on multiple what appeared to be used condoms. Upon discovering this Derek threw his hands anxiously through his long curly black hair. Stepping over the condoms Derek grabbed his underwear and jeans and began getting dressed. There was a stir in the bed and as Derek slowly turned round he discovered the young woman to be wide awake with a devilish grin upon her face.

"getting dressed so soon? Why not just come over here and we can pick up where we left of last night?" Derek laughed nervously , he knew he had to remove this woman from his trailer as soon as possible and he wished he would never have to see her again.

"so listen last night I erm …well.. ive been having a rough time and you well "

Listen I get it ok? You had a bad day you wanted to get laid and now you want to forget about it? Let me guess, girlfriend.. wife?

" Erm none ,i don't think, atl east not anymore" Derek stuttered remembering how Meredith attempted to comfort him lastnight before he shouted at her and hit his mothers engagement ring into the woods. Derek was kicking himself now. Despite the awkward morning conversation the young brunette left willingly and appeared to fully understand the situation. Upon her departure Derek became consumed by guilt and rage. He was furious at him self however he was also furious at Richard for telling Meredith about the ring and sending her out there when Richard was in full awareness of Derek's condition.

What am I going to do? If I tell her she will never forgive me and ill have lost her but I can't not tell her. She would know instantly that something was bothering me she has ways. I have to apologise for last night but how can I when this is so much bigger. I cant lose Meredith I can't, she's the love of my life! What was I thinking last night?! How could that have possibly seemed like a good idea?!"

Although Derek sat wondering aimlessly what he was going to say to Meredith and when he was going to say it he could not in all honesty remember was happened he couldn't even remember the girls name for Christ sake.

GAGAGAGAGA FLASHBACK GAGAGAGAG

W-" Scotch , wow you hit it heavy then" .. a young woman had just pulled up beside Derek at Joe's , He noticed that she was attractive she was petite and slender with long brown hair one could almost say she slightly resembled Meredith in a way.

Derek smiled but he had shown no real in depth intrest in the woman his head was swarming with thoughts of how he had in his mind 'killed' Jen.

W-" oh your ignoring me , I see ill leave you alone then"

Sensing the hurt and disappointment in her voice Derek gestured for her to say , he was angry and sad but he was not cruel and mean. Although arguably how he had treated Meredith less than an hour ago could question that.

As the night progressed the drinks were flowing and the conversation was too. Derek had decided against discussing Jen or Meredith and instead he focused all the focal points of the conversation on her. Eventually Joe announced that he was closing for the night and as the two got up to leave together Joe beckoned Derek over , Derek told the woman to wait for him that he would only be a second.

J-" do you want me to call anyone?"

D-"Like who Joe huh ? like who ?"

J-"Derek your drunk , don't you think it's a better idea I call Meredith –"

D-"NO do not call her. I am fine Joe I'm going home I'll see you later"

GAGAGAGAGA flash forward to present GAGAGAGAGA

Unknown to Derek at the moment , but last night Joe had phoned someone he had phoned Mark and informed him that Derek was highly drunk and was about to leave the bar with a girl he had been heavily flirting with all night. But by the time Mark arrived at the bar Derek was already gone and much to Mark's dismay he already guessed what had happened thus putting him in an very awkward position as Meredith was due to be on his service that day.

Let me know if I should continue this fic or not as I'm unsure but do have ideas for future chapters….