broke up a while ago but still miss him

so me and my first love broke up like 5 almost 6 months ago now and I was completely crushed how everything played out... nonetheless we broke up on good terms. i’ve been doing much better and noticed big improvement but some nights, and tonight being one of them, I just miss him and it hurts. I really miss talking to him and hearing from him and having him next to me. it doesn’t really hurt me much anymore but the nights where it does, I feel like i’m back at the beginning again. is this normal?? I just cry and cry and every fiber of my being misses him. he was my best friend and it’s still weird to not have him here sometimes.