I would go to his house and just as he thinks you 'changed your mind', I would hand him over a bag with his cigarettes, condom and note and say, "You left these in my bag, I wanted them to return them to you."
Then say goodnight / good day and walk away.

This should give him fair and ample indication that you were not impressed in his lack of respect for you.

If you feel a real need to maintain a friendship with this person...although in reality, it doesn't sound to me like he respects as a friend at all...but if you need to...you can always leave a footnote on that note he left for you saying, "When you are ready to talk about what you did, call me".

He needs to learn that you require respect and you are not to be toyed with.

As for your girlfriend, it might not hurt to tell her. But beware that she won't be happy about you hanging out with him in the future if you do. Some things are better left unsaid. And chances are this will all blow over...there is nothing to gain by telling her.

ABT