Missing ex/childhood crush

So I’m in a really stable relationship, been together 3 years no back and forth just very consistent and in love. But I have this childhood crush who I miss CONSTANTLY we’ve known each other since we were about 8 (we are 21 this year) and we just were best friends and all our parents and people thought we were gonna get married (they still think this LOL) but it’s just a lot of history and we dated when we were like 12 for like 2 months but i wouldn’t really count him as an ex😂 but there’s moments where I miss him really bad and I do still LOVE him Bc of all we’ve been through I just wouldn’t say I’m IN love with him. I’m IN love with my current boyfriend. But I just want to know is this normal? And do any of you guys go through this? 😬 honest answers please!