My bf replies after hours :/?

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Me and my bf are in a longggg distance relationship. We were together for a month- Jan, he broke up so we were apart for a month- Feb and then he got back to me in March.. In Jan, we used to text like the whole day and talk on phone at night everyday. But now, we dont text but DM each other on Twitter. In starting when we got back together, he daid he loves me alot and stuff for many days and used to reply pretty much quick. But now, he replies after 5-7hours and doesnt calls. When I call him he never picks up or calls back. Why? Help!