You all can go ahead and burn me at the stake for this but... sometimes, cheating seems like the only good option you have. I'm not saying that it's actually a good option, but at the time that's what it seems to be. It gets complex when you genuinely love your significant other, but you're also riding the fine line of when your relationship is turning stagnant, and your significant other tells you that everything is perfectly okay even when you try to talk to them about it. What do you do when you love someone who doesn't seem to put as much effort into a relationship as you are? You'd think the right answer is to break up with them, but that's hard... because you love them and don't want to hurt them. Or maybe you an't leave them because you share financial ties with each other. So as you bottle all that up inside, you start for yearning for something - anything - and when that opportunity comes along, you make a mistake and it's all over.
Cheating isn't a nice feeling to go through, no matter how good the 'in the moment' feeling is. In that regard I have sympathy for cheaters because most of them aren't proud of what they've done. And like all others, cheaters deserve forgiveness and kindness just as much as the next person. Of course, if they aren't sorry about it then there's no point in wasting time and effort on that hoe, but I think it's important to show them that their one mistake (if it was once only) does not define them and their morals for the rest of their life. That is, assuming we're talking about a one-time cheater and not the chronic soul-suckers who like to keep multiple people plus back-ups 24/7.
I will now comment on something earlier from this thread:
She told me she cheated because.
1: Her boyfriend has a belly, the one she cheated with is a lifeguard (ripped and attractive)
2: She felt like she had no "excitement in her life"
3: Her boyfriend wasn't spending much time with her.
4: She thought it was going to "teach him a lesson so he'd spend more time with her"
The key things to point out here are that she felt she had no excitement in her life and that her boyfriend wasn't spending much time with her. What a shitty engagement they were both in, don't you think? It's not just her fault, you know. I think it's safe to say that lot of physical attraction to a significant other stems from the emotional closeness you have with them, and if there's emotional distance, you start seeing more and more of their flaws (emotionally, mentally, physically, etc.). I don't know the entire story, but if she had talked to him about spending more time with her and he just never tried, then he had a hand in pushing her away. Granted, it's never right to cheat on a boyfriend/girlfriend, but it should be understood that a relationship is a two way street; you actively seek the satisfaction for yourself and your partner. And if you aren't doing that, then that's a problem that often leads to cheating and bad breakups, etc. The deterioration of a relationship starts when one person starts to neglect the needs of the other, whether that's physical, emotional, mental, spiritual or whatever. The love and trust has already started to fade away.
Anyway, I read something interesting a long, long time ago on why people cheat, and I remember there being two kinds of cheating: physical and emotional cheating. Unsurprisingly, most males are worried about their girl committing physical infidelity, and most females are worried about their man committing emotional infidelity. So with that tidbit out of the way, why do people cheat? For a variety of reasons, but the most common seems to be the unwillingness to give up the security of a stable relationship at the risk of potentially ending up alone. Someone had already mentioned it here, I think. Having a significant other and a lover ensures that you get the most emotional and physical fulfillment you can get. It's said that men who cheat want physical attention whilst women who cheat want emotional attention and affection. Obviously, the reasons are going to differ from person to person, but if you want more general reasons, those are it.