Is being a faithful man a waste of time?

I'm wondering if it's worth being a faithful man. I had to go on a long business trip for 10 months. I told my girlfriend that I'll try coming back earlier. While on the trip, I was earning 3x more and saving it. Part of the money was spent on my surprise gift for her. I've manage to convince my manager to be excused early. I came back after slightly over 6 months.

I found out she cheated practically the whole time I was away. There was my surprise and I had to take another flight, go back to that jewelry store and return it. Honestly, do girls generally like faithful men or not much? I'll never get back 4 years of my life wasted.
Is being a faithful man a waste of time?
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