I am just really confused overall by his behavior?

roxystars19
My friend has been having some arguments with his girlfriend of three months. Before he got with her, he used to tell me everything! But once they started dating, I backed off a bit and gave them some space. I saw him today and within a few minutes, he began telling me about the fights they've been having, what he can't stand about her, "what if we break up", he can't stand her friend, etc. He also never referred to her as his "girlfriend" only the first time when I asked about her. I just listened to him vent and rant, but was kinda confused because I thoughts guys didn't talk about their relationship issues with other girls? He asked about my dating life and I told him about this dude that my friend is trying to set me up with. When I showed him this guys social media he got really mad saying this guy is a walking red flag, called him gross, saying my friend isn't really my friend. When I said I had to get going, he said things like "I miss our conversations" "I wish you could stay and talk to me longer" etc. But when I suggested coffee he declined, saying he is too busy. I even said he could bring his girlfriend and he said, "We'll see."
Now that l've typed all that out, I guess my question is whether or not this is normal for a guy in a relationship?
Like him telling me after his girlfriend's and his problems for example?
I am just really confused overall by his behavior?
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