Boy problems

So ive started university and ive met this guy who ive totally fallen head over heels for. And yes we have hooked uo a couple time, but he also came to my room one night and we sat here talking for 4 hours and nothing happened. He just got out of a bad relationship and niether of is want a real commitment right now. But whenever i try to text or hangout or just talk to him he ignores me and never resonds, i feel cligny and onsessive and desperate and i dont want him to think of me that way i just want him to remeber im here and still an option. Any suggestions on what to do?