How to know if he’s the one

Ok so I dated this guy. We dated for about 3 months and my family completely fell in love with him. They trusted him he came to our family stuff and it was great. He was at the point where he was ready to say I love you. I wasn’t. I felt like his feelings kept growing as the relationship went on but me stayed the same. So we broke up. I broke up with him and it was very hard. It’s a few months later and I still think about him and miss him. Problem is he’s going to college in a few weeks and I’m still in high school. If I miss him and wanna gift it another shot is it worth it even tho he’s leaving? Also is it worth having to go they a breakup again?