need advice,please.

Ria

me and my partner was a classmate in highschool, Chairmate for exact. He's my really close bestfriends until we're on the senior year and we decided to take us on a relationship. tbh every thing that leads to sex that i do with him was my very first time. and as long as we're in a relationship we never really had sex, only kissing and a lil bit foreplay.

when we're in college and we went to different University, we finally decided to end our relationship, but we're still close, chat and videocalls still goin between us. after we breakup, we finally had sex, yeah, real sex. almost every two weeks on weekend he come to sleep over and we had multiple sex all night long. I admit that actually sex is a very good thing. But sometimes I do scared about the thoughts that maybe someday he'll totally left even he said that there's a time when we will be in a relationship again.

what should i do?