Hi There,
I hope you dont mind me contacting you but i have been reading the post you put on here about regretting a one night stand and the feeling of feeling used afterwards,i realise the post is a few years old now,but this recently happened to me,and like you did,i keep punishing myself for making the mistake of trusting someone who i thought liked me.....

I have been in a deppression about it for a while,he has made me feel cheap and used and i just dont know how to get out of feeling this way,how did you cope with it in the end????

I hope you dont mind contacting you like this,but everything you discribed is what exactly what im feeling now ,I would be grateful for any advice you can give me