I miss my old friend and he doesnt respond my texts?

last summer i met this incredible guy who i became friends with. when summer was over, we kinda stopped hanging out. its summer again and im getting nostalgic. laast week i texted him and he didnt answer, it has happened like 4 times already. i was just reading old messenger convos and some tears fell from my eyes! i really really miss him. what should i do?