Am I wrong for this.

Shay • Just living life day by day step by step.
So me and my Ex-Boyfriend dated for for about 6 months and it was okay you can say I'm a very forgiving person he was sexting a girl for like a month and I freaked out and forgave him because I understand mistakes. I made an mistake a few weeks ago and because im a honest person I told him. He got mad that I kept it a secret for three whole days before I said something and he couldn't get over the fact that I made a mistake so he broke up with me I know our relationship was coming to a end but I was trying to fix it because he was my first love. It's been about two weeks since he broke up with me and I started talking to a super old friend and all my feelings for this guy is coming back and I don't want to look like a slut or something.  I feel super bad because i was dating this guy for 6 months but I don't want to sit around and mope because he broke up with me and I don't want to lose my chance
With this other guy we're going on a date and Friday and I don't know if I should go or not.... All my friends are telling me to go because they never really liked my ex and really like this guy a lot. I just need an outsider point of view.