Dubious relationship?

I'm married, mostly happy, I love my wife and I certainly don't want to hurt her. But I'm not very happy with it, we used to be pretty good, but not the past few years. We don't share a lot in life and that's put quite some distance between us.

Back in the day, we were the best when there was tension between us, I used to have these tense/intense almost relationships with others, almost only online, only emotional. That raw tension made our relationship stronger. This other woman would become my muse.

These days I don't have a muse. I don't want to hurt and disappoint my wife, but I'm not happy with the current state of our relationship either. So far that I'm considering a divorce, which would hurt her even more. This is killing me and I don't know what it do. She understands the problem but is overall not happy with it, even slightly hurt by my thoughts. How could I make this better, any suggestions?
Dubious relationship?
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