I have a best friend who had a boyfriend that she was going out on and off with for 8 years, even being engaged at one point. She just broke up with him because she didn't feel the emotional connection with him anymore. She started to see her relationship with him as simply an attachment that she didn't have the strength the break off.
If he isn't right for you, then it's a good thing that you realized now, instead of waiting another five years.
I understand how the post-break-up phase is like as well, feeling that empty space, both physically and in your heart.
It may not be so now, but it's going to be okay.
Have a