How can I get my friend/ former biz partner to forgive me? i know this is not marriage?

I initially met my friend online. We started out chatting and I admit got a lil' risky on webcam if you know what I mean...but in general we could talk about anything 'cause we developed a friendship. We both are into art, drawing graphic design and so forth. He is talented in a few more things than I am and vice versa that's why we decided to team up together. Well he lived in ATL I live all the way in nyc. For a period of time I didn't hear from him at all, he moved to alabama and come to find out he has a new girlfriend, this may sound stupid of me but I was jealous because I had feelings for him..he was the first man I really like since trying to get over this hard break up with my ex. I felt like if i didn't reach out to him with the con't of our projects we were suppose to do he would've never contact me. I was furious cause while we on web cam in that ual way he making plans to be with his new mate and im not the type to flirt with no man if i know they are involved. Anyway when I found out he was in a relationship via his facebook I talked to him on the phone i was furious, he aplogized despite in realty we do live far..he said if he was in nyc he would've been with me. Anyway I did projects..sending him the projects and over a week goes by and he gives me no feedback but yet writes on his fb talking about a football game, when this is serious to me..the both of us if we are making a business. I was so mad that I wrote him saying he is unprofessional and how he only paid me attention when i was on webcam but since he has this woman now he is dissing me..I deleted him off my facebook..I admit i got out of hand angry but I felt the work wasn't being produce efficiently at all and he was slacking...him and i both go to school and biz with other things but i was more on the ball with our projects..I am not making no excuses for myself but after I calm down i tried reaching out to him but he won't forgive me..i know all of u are going to let me have it..but do u think he will ever forgive me..i wrote him a letter to forgive me but he never responded..do u think i was totally wrong for thinking the way I thought?