Relationships ....

So me and my ex were together for about 9 months and we were pretty serious . I got a job and things got really hard considering i was 16, working, going to school and trying to manage a relationship.. I would see him trying so hard to make time for me and I wasn't doing it in return and I'm not sure why ... So I told him we were better off not together .. I did this because there was this new kid at my job who was showing me attention and I began to see more of him then of my boyfriend so it was hard for me to not want the attention he was giving me.. Now we are broken up and I want nothing to do with that kid that i worked with and my heart is completely a mess ... I loved that boy so much and I hate myself for letting this happen ... I don't know if I should text him asking for closure hoping that it will help my heart break or just leave him alone ... So thoughts on this ?