I dont think you need help in this scenario, in fact, I think you need some strong advice on morals. It is, unacceptable, in the eyes of a woman, for you to kiss her and then kiss someone else if she is around. This will, completely obliterate any chance of getting her to invest in you after the party. However, dont let this stop you from doing so. Just be the 'SMART GUY', and isolate the other girl you hope to kiss close, and do the deed. As for the apology, thats great. women work based on using emotions to communicate, and here, you are expressing to her that you are an emotional guy...and that you have feelings. For her, this is important. good move.
Now, you have her in the palm of your hands. DO NOT bring up the partying scenario on the date, or mention anything about the awkwardness of the cafeteria meet up. You want to start the date in a completely positive frame. Taking lead here is important. Women adore men who are confident, and lead - its a fact: WOMEN WANT TO BE DOMINATED, but in a calibrated manor. Im sure you've been on dates before, so remember the main thing is to enjoy yourself and to make sure that YOU are catered for as much as SHE is. Balance the investment - you buy the lunch, she buys the drinks. equality. Goodluck and all the best.
