boyfriend watching porn instead of sex w/me

I feel very hurt and disappointed, My boyfriend of 8 years decide to watch porn instead of having sex with me. It's not like I am not will to try new things with him. Every time, I try to have sex with him. He tell me he is tried, we only have sex like 3x per month. I caught him a few time watching porn and beating off. When I ask him why does he do that, he tell me. He doesn't know and he just tells me "I'm sorry" and he won't do it again, a few months go by and then once again, the same thing. I just caught him yesterday. I try talking to him once again and he explain he was boring and he likes seeing naked people. I don't know if he has a porn problem? or is it normal? or should we go to counseling? Whats worse of all I found out his planning to give me an engagement ring, I am not sure if I want it, because I am really hurt. am I make this bigger deal? I don't know what to do anymore:( Any Advice?

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