Robx, if you look on this forum, there are many folks here who are committed to being faithful...even some who forgive and work it out. You're right, there are a lot of people who let human nature and temptation get the best of them, but they are missing out on something bigger than themselves.
I didn't say have an affair so I don't know what you are trying to say by "committed to being faithful", all I'm saying is observe reality, follow reality, reality doesn't lie. If you want to cling to marriage vows and believe that your spouse should do the same regardless of crappy marital conditions, disrespect, lack of love, affection and attention, poor sex life, etc. well then you are deluding yourself. Those wedding vows you made to one another are only words, and words WITHOUT actions are just words and when you try to explain away your actions as to why the marriage went sour (ie. long hours, work, kids, money, etc.) you are just making excuses: excuses don't explain and explanations don't excuse. If you could have done better, you should have, plain & simple.