How to reconnect with old crush? Guys advice would be very helpful?

I met this guy at work last year November and at first didn't think much of him he was just a cute guy at work. But then I realised I had a crush on him. And once I did it turned into suchhhh an embrassing crush. The kind where I literally couldn't't talk to him without forgetting who tf I was and would feign my interests around him and such (allow me, I'm 17 OK). The worse thing with this is I think he actually had a crush on me until I developed one on him and got all awkward. Like I would act mean for no reason, and say whatever popped up in my mind making me sound stupid. I left the work place the beginning of January, but mid January I kinda needed that guys help with something. So I texted him if he was down with it and he was like sure. So we met up again and we actually had a normal conversation! I think at this point I realised I didn't have to change myself for him and he was just a normal guy. After that we texted for like a week but then he ghosted me.

I've tried to get over him and just forget or do other things but its harder then you think. Its April now and I'm wondering how can I start conversation again without coming of as too clingy or anything?

(By the way I was QUITE obvious with my crush towards him, one of my old colleagues guessed I liked him and even told my boss I liked him even though I denied liking him when my boss asked. So its possible he's guessed I like him if that changes anything)