My boyfriend of a year is going to graduate, and I am worried.?

I need as many answers to this question as possible. My boyfriend (18) and I (16) have a GREAT relationship without doubt. We have had our share of quarrels yes, but we do share a strong feeling of love for one another and that is why we are still together. Currently, we attend the same high school so we are used to seeing each other very often. Unfortunatelly, he is going to graduate in a few months, which will greatly change the frequency we can see each other. Thankfully he is just going to the local community college, but I still don't know what to expect. There is no reason for me to be worried abut him cheating....he is acctually the innocent one in most arguments and he is the better hearted one too. But i still am worried....mostly because his schedule will change( because he is going to get a part time job too) and we wont be going to the same school, and well meet different people....but i want to reure you again that our relationship is great and no one has ever cheated or anything. I also think that all this worrying and unneccesary fighting is because of me and my insecurities. We are great for each other, but my issues are that i am slightly insecure and I am too dedicated to him....I feel like i don't spend enough time with my friends because I dont make an effort to and I am affraid i will eventually become clingy. I also suffer from JELOUSY of the SMALLEST things which leads to unnecessary fights. I dont want to be demanding so much time from him, but i dont have much anything else to occupy my time....PLEASE...put yourself in my shoes and help me