As you grow older, you come to the realisation that cheating in relationships isn't massively uncommon. The average age of my friendship group is about 35, and they're predominantly male. Two of them are married - both regularly cheat on their wives with the friends/colleagues etc, but equally would do anything for their wives. I'm not exactly justifying it, but emotional connections and sexual desire can be two very different things; sometimes it just becomes a lifestyle choice.
The people I know that cheat are not inherently bad people - they just equally enjoy hitting on someone in a pub and the thrill of bringing her home as much as they love coming home to their partners to watch TV with a glass of wine together. Also, most people on TSR don't know what it's like to be married and kids and a mortgage - it's not like teenage relationships, it's serious stuff.
Some people are in abusive relationships and need an emotional connection with someone else to help them to muster up the strength to leave a violent partner (unsurprisingly, generally they don't take it well) - sometimes this connection becomes romantic.
Sometimes people find the love of their life really early on, and have only experienced things with one person, and thus may feel a little entrapped. Either someone flirts with them, say, at work, and the fantasy of being with someone else/being wooed by someone else/going on a date with someone else is sometimes acted upon, or the other person in the relationship has experienced a lot more, and you feel like you haven't has those life experiences (thus seeking to have them given the opportunity)
Not all cheaters set out to hurt their partners - sometimes the issues are more heavily embedded - not everyone can communicate their partners (as evidence from various threads on TSR), and for some it can be a form of release or revenge (rather than arguing), and then the cheater lets the issue go.
I don't think it's right, not at all, (I've been cheated on before, and it is heartbreaking) but my message is, who are we to judge someone else's relationship? People will do what they want with their lives in accordance with their own moral standards, and that doesn't make them a -insert profanity here -
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