Need serious advice on what to do! what can i say?

So just recently i had a pregnancy scare because my period was hella late and last month i did some stuff with this guy who i've known sense i was 5 and we've always liked each other and have gone out but its complicated and i've been wanting to move on from him but i can't cuz as cheesy as it sounds I'm in love with him…

So cuz of the scare it really opened up my eyes, (b4 getting my period) i talked to my bff everyday and we had a plan to get a pregnancy test and stuff and planned what to say to him if it came out positive

and i knew that if it came out positive that means that he would be the father and i had to think if he would b a good father and stuff and could i truly see us spending the rest of our life together

and i thought, Yes, he would b and i can see us together, and i know for a fact he wouldn't leave me if i was pregnant

but now, idk what to do… what should i tell him, what should i do? i think about him every single day

and should i ever tell him about my scare?

thanks ahead of time