hahahah... DOn't worry. We all think like that. Truth is that every boy at that is a freak- they can't help the hormones. On the other hand, it is alot better than it sounds to be. Don't worry just too much yet. Worry when MG is an uppergrader rather than the upper graders now. I say this because i am an uppergrader and gosh knows what is going to happen this year!
I have a feeling maybe he thinks the same way about the situation. Maybe he can tell that you told him to go back to that girl because of the reasons you said, and that he also would like to be your friend. Maybe he just doesn't want her to find out and be all jealous again because he still likes you. In any matter i still think you should talk to him.
I start school on the 28th, next thursday. Junior year here we come!