How do we find contentment in our wives?

Ok here's the thing, I'm 27 and parents are sort of pressuring me to get married now. But I'm dreading the fact I have to spend the rest of my life with that one girl. Is that one girl really enough for us? Has Islam, for this (and other) reason allowed us to marry up to 4 wives. I just don't want to end up like the many unhappily, dissatisfied, unfaithful men with wandering eyes who are obsessed with Page 3. To whatever degree, men do cheat and they do it more than women. Are the women to blame for this? Are they not fulfilling their duties as (good) wives and not giving their husbands what they want, when they want it; i.e. food sex etc. I believe men will only go astray or cheat when there is something lacking in a relationship. The wife may not even see what's missing. Maybe the man wants kinkier sex and is afraid to ask, or has already been turned down, or the constant nagging, whining. What are your thoughts?