<human>: Summarize the given text in a few sentences.

EDIT: forgot my age/gender I'm 21F

Ever since I got back from study abroad I've been dating this guy I really like, and he never gave any indication that he wasn't interested in me. Always asking me to come over and hang out/go get drinks. He told me in the beginning he didn't want to get too serious because I was working and sill in school and he didn't want to be the kind of bf complaining I never ha enough time for him. 

Which was fine for me. There was about one week in the middle when I didn't really hear from him and I assumed he was busy with his job and I texted him a couple times just to chat and then he called me and joking asked why I didn't ask him to hang out. 

Well since my school started, he started a new job and has been working tons of hours, last Sunday it ha been a week since I'd seen him and I asked him out to dinner and he seemed really happy to see me and even said he'd take me out the next weekend since I paid. Well this past weekend rolls around and not a peep from him and I text Friday asking if he has plans, all I got back was "working til 9". I haven't heard from him since. 

Now I'm wondering if he has just been too busy, isn't interested, or has just been interpreting me as not interested. It's killing me not knowing why. Should I just give up, and forget him? Or should I text and ask him what's up? How would i ask without sounding desperate or making a fool of myself??

Sorry for the wall of text. I'd really appreciate y'all's help, I really like this guy.
<bot>: things seemed to be going really well with this guy, haven't heard from him for almost two weeks, should I forget him and move on? Or ask him what's up? (And how do I ask?)