I don't think I can help much, the way you describe it, I am confused by her too. If she isn't a complete whore (which I'm thinking she isn't) than the fact she gave you a hand job suggests she still has some feelings for you.

Unless of course she was over and you kept trying to have sex with her. Sometimes when girls don't know what they want at the moment they will give a little in that way, but won't do anything else until they realise what they want. Kind of a way to keep you happy in case she doesn't want to leave, but at the same time holding on to her dignity.

I would take Skinks advice and cut back. You also need to talk to her and cut back on the smoking. You shouldn't have to be stoned every waking hour of the day. Talk to her about it and try and find out if their are any other reasons she is so upset with you right now.