Why do I feel like my wife is going to cheat in the future?

You know with all these break ups and betrayals going on in relationships its kinda hard to think that your spouse is entirely devoted to you. For some reason i believe all women have a weakness some how and some way to allow themselves to cheat. Guys of course are weaker than women so..yea. but i just feel like women of today are so caught up in the riches and glamour. And some are so gullyable to guys wack cheesy lines. But dont get it twisted im not insecure im just curious.