Being with someone....

How do you know if you and someone should be together? ....I used to be with someone but we're not together anymore. I felt like I was the only one putting in effort and our relationship just seemed off....I started to drift away from him because he wasn't showing me that he really wanted a relationship, he wasn't proving himself and in order for us to talk I always had to text him first, and we didn't really have anything in common. ....My feelings weren't that deep but ya....I think if I just focus on school and not too much on relationships the right guy will come around.