Please help, I really don't know what to do?

Ok, so here are the details: My ex and I dated for a little over a year, btw I am 15 and so is he. We are each others 1st's. We both go to different schools now. When we first started dating we went to the same school, then summer came and we had to go to different schools for the next year. So about a month ago, I broke up with him. It sort of feels like I shouldn't even have to ask for help because it was me with the problem not him. Anyways, Valentines day is comming up and I don't know what to do, or what to do in general. Heres my delema: I broke up with him because being 15, Ive relised that a relationship where we dont see each other more than once a week, keep in mind that once a week was only allowed to be about 6 hours, and the inability to drive, we are just too young to date. I still really like him, like if we both were able to mature and actually have the ability to see each other, then yes I would date him again. But for now, being friends is really nice. Last night he invited me to go to dinner and then back to his house and just goof off, dance to loud music, do whatever was fun, for Valentines day. I dont think I am going to accept because I dont think thats really a good thing because we did break up. Going to dinner I think would give him the wrong impression. I want him to know that he needs to step up and everything he wants to do with me cant be that easy. Am I right not to go to dinner with my ex? Also, because I still feel strongly for him, I miss hugging and kissing and holding hands and messin around with him, even though I dont want to date him right now. Its hard to resist some of those things because they became a part of my life after a year. Im reminded everyday in my mind of how I hurt him and I feel badly for it. Because the breakup is still new to me and him, it takes ahold of our minds all the time. What should I do about that? And I know people say all the time busy yourself wit hobbies. My hobbies are art and I express myself with art. Not a good thing because I end up painting a rose falling from the sky.. Tell me your honest oppinion on all this because I really could use some help..