Regret making me ill

Hi all i'm 23, i feel absolutely terrible today and as such had to take the day off work due to very bad nausea i am putting down to stress. Basically i was kind of in this love triangle with this girl that me and my friend met..and i did have the opportunity to have sex with her (he had done previously by the way). Went back to her place and she practically had her clothes off and so did i, but we just ended up playing with each other and kissing and what not. but sex didnt happen (truth be told i had been drinking a little, it was like 2am and i was so so tired from work) I really and deeply like this girl, she likes my interests and we got on famously. Now though things are different..she is into him now, with him and i have no chance. I have been fine for a few weeks but now i am riddled with regret..so much so that i couldnt even make it to work today because of how bad i feel. I'm an idiot, i do not get many chances and that one i didnt take. At this point it feels as if i will never be happy again and regret it for the rest of my life.

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