Help plz! Guys Perspective on this immature past?

Please dont think anything mean! When I was younger I was asked out by this guy I really liked! He was very charming and sweet and hung out with me 24/7 and was rlly into me...(I was very scared with him because I never had a relationship and the only experience I had before was a guy who lied to me abt who he was for months and dumped me after he knew he couldnt get anything physical. Naturally it made me even more scared that the next guy was using me.) Because of the past I was so paranoid abt this new guy I liked that once he said he just wanted to take things slow since I was scared and just be a friend, I immediately thought I was played again! It made me so sad that I ignored him for a year and even ignored his sorry texts and also when he walked up to me to say hello at school I walked away from him! I was more upset because I found out he dated 2 girls right after me so i thought he was a womanizer again... A year later we ran into each other and I actually said hi because he texted me earlier tht week to say hi and I just was over him and the situation and decided lifes too short to be mean. He then wanted dinner and had all these questions abt why I ignored him! I only said because I thought he lied the whole time. We are friends now but I never told him abt any of the past just that I thought he was a big liar...I was wondering if i should tell him the whole thing? Or is it lame and not needed? Please be nice! :) I appreciate it aloottt!