heyyyyy yall! soooo this is happening!

my childhood crush like bad crush and me started talking on facebook after 19 years. I was a like 10 he was 19 and i remember i always walked or ride my bike all the time just to peek at him lol! we are both divorced now he is single and the problem is i currently have a boyfriend! ive been with him for 4 months. But this is driving me insane because i cant stop thinking about him! He wants to go out to hang out and im so nervous what should i do?????? should i give it a go or na?