How do you show your crush that you are interested?!?

J✨ • Student Nurse and PCOS sufferer 🇬🇧

Okay... so a few months ago I posted a post about a boy that is showing signs that he is interested/ likes me and I like him too. But how do I show him that I’m interested?!? What signs or signals did you give your SO or ex (etc) before dating or hooking up etc.