Is dating an ex boyfriend's friend ever acceptable?

My ex and i broke up three months ago, we dated for about 13 months, we loved each other but we just weren't right for each other. He was the type of guy who didn't show emotion much, and he gave a hard time to people who did, including me. it was really hard for him to tell me he loved me.We ended it... show more My ex and i broke up three months ago, we dated for about 13 months, we loved each other but we just weren't right for each other. He was the type of guy who didn't show emotion much, and he gave a hard time to people who did, including me. it was really hard for him to tell me he loved me.We ended it because i needed more from him but he was unable to give it. Last month i met this amazing guy who was the opposite of my ex when it came to emotions, He didn't have a guard up like my ex, He even cried in front of me once. Usually i don't rush into dating someone so fast but it just happened . Only after we started dating did i found out he was friends with my ex, not best friends but buddies. In the 13 months my ex and i were together we never met. My ex knows about it now and isn't happy about it. i feel like the right thing to do is break up with him but i am starting to develop strong feelings for this guy. I don't know what to do. my friends say i should stay with him but they never really liked my ex to begin with so their opinions are bias. I want advice from people who don't know me only the story. Is our relationship acceptable?
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