Should I just forget him?

Ironically i have the same exact problem you have right now (but its me and my first love)..well i say since you know he got the message wait until he needs you, find out when your friends and his friends are going out so maybe possibly you can talk there...that whole "idk i don't feel like talking" is just a phase he will come around trust me many guys do this (we will never get why though)..so play cool and its fine to have him in Your mind but of course don't make it a need to have him around or always there cause then reality will set in that your being depended on him..so yeah keep going out maybe even get some new numbers but don't over think about / text him let him text you sometime, -Hope this helps ;)