How to Know if Your Girlfriend Is Cheating on You

[edit] Steps
Observe. What led you to beleive she was cheating. Is it her new "Friend"? Is she spending less time with you? Is she staring at some other guy when you talk to her?
Tell her you love her. Does she say it back? Hold her hand. Does she try to pull it away? Does she look nervous? Do her eyes dart around possibly looking to see if "the other guy" is watching? These are signs that she MIGHT be cheating. However, some girls are shy and if the relationship is new she may be uncomfortable with some things. Although, if it is new, she probably wouldn't be cheating, would she?
Many women in this day and age have confused sexualities because of shifting standards. Your girlfriend might be cheating on you if she is experimenting either with kinks or other genders. Do NOT confront about this. Try looking for things in her web-browser history: Google searches, Wikipedia pages visited, maybe even porno sites. If you find anything like bondage, anal, or bisexualism, try bringing it up as if it were your fantasy. More than likely if she can find it at home, she won't go looking for it elsewhere.
Remember that the reason cheating is painful is not because of the act but for all the reasons it took place. Do not focus on the cheating act - try and repair or confront any relationship troubles. Either your relationship will end or it will be better than before, and either way the majority of the time she will confess to cheating.
Ask about her from her friends.( not "IS she having another boy friend ).But her regular activiteis.Then you will be able to get some tips.
Ask the specility of your from other boys.Then if she starts to think after answering you that means she is thinking about the other BOY.

[edit] Tips
Don't just randomly ask her, "Hey, you wouldn't happen to be cheating on me, would you?" She's going to say no anyway and she'll think you don't trust her.
Girls are allowed to have guy friends. And they are generally more physical with friends, regardless of gender, so don't assume she's cheating if you see her hug another guy. Might want to just watch a littler closer.
If she happens to text "guy friends" out of the blue, asking them to hang out. Usually means shes thinking about it. Usually if the guy friend asks her how she and her boyfriend are doing, it means that the guy friend wants to "hook up". Making sure she is single, but usually that doesn't matter. And if that doesn't stop her from wanting to hangout with them, shes definantly wanting to cheat or at least thinking about it.

[edit] Warnings
Accusing a girl of cheating may get you dumped.
The only way to really know is if you catch her. But please don't stalk her in an attempt to catch her cheating.
Nothing you can do will dictate her actions. Sometimes there is simply nothing you can do but walk away. Never, ever dismiss this as an option or you will not get anywhere.
Hacking into her computer, phone etc is illegal. But it may be the only source of evidence you get.

[edit] Things You'll Need
A level head. Do not fly into an emotional rage or you WILL make mistakes.
A serious sense of identity. When you're thinking short-term and small perspective, you will not be able to cope with everything. You as a person are more important than any relationship, and any relationship that can't be worked out isn't worth sacrificing yourself for.
Connections. Get to know the people close to her its not needed but knowing her friends could ultimately mean that you can use them to confront her about it.

[edit] Related wikiHows
How to Keep Your Girlfriend Happy
How to Act Around Your Girlfriend's Parents
How to Keep a Phone Conversation Going With Your Girlfriend
How to Earn Your Girlfriend's Trust
Articles for You to WriteHere is a list of suggested articles that have not yet been written. You can help by researching and writing one of these articles.
How to Cope With Cheating
// custom ad length based on height of article
var a = document.getElementById('article');
var skyscraper_max = 5;
var max_channels = Array("6694960519", "8197413600", "6748794929", "8446749440", "8228616242", "6838817626", "0192612487", "5112519864", "2202295037", "9934746057");
if (a){
var height = a.scrollHeight + 333;
if (height > 1300) {
skyscraper_max = 5 + Math.ceil((height - 1300) / 100);
}
if (skyscraper_max > 14) skyscraper_max = 14;
xchannels += max_channels[skyscraper_max - 5] + "+";
}
randNum =Math.random();
google_max_num_ads = '2';
if (randNum Ads by Google';

if (google_ads.length == 0) { return; }

s += '';

for(i = 0; i ' +
'' + google_ads[i].line1 + '' +
'' + google_ads[i].line2 + ' ' + google_ads[i].line3 + '' +
'' + google_ads[i].visible_url + '';
}

s += '';

document.write(s);
return;
}
google_ad_client = 'pub-9543332082073187';
//ad_section, google sky, page wide track, no intro photo, RQ4, PH 2000-3000, 20-50 edits, RL Below, no related vids, Relationships, Main namespace
google_ad_channel = '7604775144+7733764704+1640266093+9911500640+9665908481+3322788282+9016233241+8388126455+8941458308+7023841635+7122150828+' + xchannels;
google_ad_output = 'js';
google_ad_type = 'text';
google_ad_width = 300;
google_ad_height = 250;
google_ad_format = '300x250_as';
google_feedback = 'on';
//-->