This is what worked for me and few other people I have talked to. The site seems to be very pro 'no contact'. My approach was a bit different. I would not tell her you are going to move on. Just give her the vibe you are having fun on your vacation tell her about your trip and be the old fun you. I would try to keep things light but if you guys planned on talking about your situation tonight this is what I would do. Tell her you love her and you want to be with her but you don't want to be with her if she doesn't want to be you. Tell her just want her to be happy. Also say that this break up is probably a good thing because it has given you the chance to reflect on the relationship and see the mistakes you made. Tell her you are going to enjoy the rest of the summer, have fun, save coin (whatever positive things you plan on doing). Take an interest in what she is doing (without getting nosey) not just pertaining to your relationship. Try not to get emotional stay positive and only let the conversation go as deep a she lets it go follow her lead that will help you keep it light.