Why would my boyfriend get upset when I try to communicate him about our relationship?

Anonymous
Recently my boyfriend has not been a good to me. When we go out with a group of friends, he will pay more attention and flirt with other girls right in front of me. I caught him talking to a girl and he was rubbing her inner thigh right in front of me and thought that was disrespectful towards me. Our friends notice that and they question our relationship and what my boyfriend did to me was not right especially touching a girls inner thigh. It made me not in a good mood all night and I did not want to be around him. When we got home he notice I was quiet and asked me whats wrong. I told him that him rubbing that girls inner thigh made me upset and questioned our relationship because he pays more attention and flirts with other women in front of me. He got really upset and started yelling at me calling me names and putting me down. He always does that when I try to communicate with him about our relationship. I think its an immature way to solve conflict in a relationship.
Why would my boyfriend get upset when I try to communicate him about our relationship?
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