Hahaha you should have posted this in LM for sure. Anyways, keep reminding him of how much fun he had the weekend when he decided not to worry about her and tell him that he will be able to have that all the time. Alternatively, you could take him out and try to introduce him to some cool, good looking girls so his mind will be off the other girl. He seems like he's really into her, so he'll probably get all upset and want to go back to her at first, but he'll realize how much better off he is without her after he's out having a good time with his friends and meeting new girls, not worrying about coming up with an explanation for the solid 7.