Is it wrong to be upset about this??

So I got back with my ex (stupid mistake) and finally met some of his friends and one of them caught my eye we started talking just friendly shit nothing more we clicked very well but my Ex made me block him because he wouldn’t stop talking about me now me and my ex broke up I cant get his friend out of my head and he said he couldn’t do that to my ex I understand bro code or whatever but it kinda hurt ya know he looked after me whenever I was upset and always thought about me because the relationship between my ex and I wasn’t healthy I really think we could be something special should I keep trying or let it go?