Am I the problem or he's the problem in our relationship?

These days he gets busy with his own schedule, while I became axious without him and at the same time my male best friend is always with me to comfort me even sharing his hobbies while including me. My boyfriend doing the same thing but it was more focused on him. Anyway I'm getting mixed feelings for my best friend and at the same time I'm hungry for "it".. I know it's wrong to cheat on my boyfriend. I'm doing my best to not let my guard down.. you might tell me to confront my boyfriend, but I'm not good at talk and I don't want to be a selfish girlfriend who always want to be around him.

Am I the problem or he's the problem in our relationship?
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