what do i do?

i have this boy friend who i started a friendship since 2023 on college and we are talking till this day even after not seeing each other anymore, we actually talked more when we were seeing each other, now we just sent reels and talk about something from time to time, but is not full conversation just reels now, and in february he stopped talking with me for 4 days, he didn't say anything and came back like nothing happened, he didn't even bother explaining, i got hurt and did not answered him for 4 days too, but he didn't seem to care and we talked normally again, i thought we were good but he did it again he's 2 days without talking to me idk what to do.. i really like him, he's my only friend that i like to talk (I'm not his only friend and he talks to a lot pf girls) should i ask why he did it? if he talks to me again after some days should i answer him normally? idk what to do help