Distant boyfriend?

My bf and I have been seeing each other for 3 months now. Every night and morning i would wake up to a morning/night babe 😚 text and hed text me all the time as much as he could, then on the 4th his grandpa was in the hospital and dying and since then hes been really distant in our relationship. Rarely do i get a good morning text or good night text, he sends maybe 4 texts a day, doesnt have time to talk or see me, everything is just on hold. Like the cause of his grandpas death made him not want me anymore. What am I supposed to do?