My gf keeps a couple condoms in a small pocket of her "bar" purse in case we are out and end up having sex. I looked in her purse in front of her...not to snoop just for shits and giggles, and noticed one of the condoms was missing! I was shocked and confronted her about it right away, she calmly shrugged it off and said she has no idea where it went, she then said she swears she has no idea. I didn't push the issue, and I told her I believe her but the more I think about it the less I believe her. She seems very convincing! but still it seems odd?

Back round:

We had some issues and broke up for about 4 days about a month ago, everything is better now and our relationship is great! but it was rough! now things seem much much better!

She has lied to me in the past (a while back) about keeping in contact with ex's ect ect...she has never cheated as far as I know.

At least she didn't cheat on you WITHOUT a condom.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn

Either you drop it or this haunts you for the rest of the relationship.

Most people can be detected when they lie.. Notice these when interacting with people.. It becomes a habit and it will make it easier for you to know if he/she is lying to you.
1. Did she get very defensive?
2. She is looking in your eyes when talking? ( Note that some people are really good at this and can lie to your face without any problem)
3. Did she change her voice tone?
4. Is her eye direction to the left?
5. Sluttering?
6. Does she seem uncomfortable with the conversation?
and many many more.. If most of the above were true then yes she cheated on you. Break up with her. You, or anyone should not deal with this shit at all.

Here is a little trick I like to do.. Change the subject.. If you feel her state is more comfortable then yes she is lying. If she brings up the previous subject up then normally they are not lying about it. Use common sense and not feeling on this one.. Even if she is very very persuading, some shit don't add up sometime and it is really fishy. Give her the benefit of the doubt if you are not sure and don't have enough clues.

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In this world, you don't get what you deserve but what you fight for!

Great advice! Im afraid to confront her and come off as insecure although a missing condom is a big deal in my eyes...

Try this. I'm not sure where she keeps her purse normally, but think up some plausible place where the condom could've fallen out, like the floorboard of your car or something, and tell her you found it there. If she did cheat on you and used it with another guy, she'll know it's impossible for you to have found the condom. When you tell her that you found it, look right in her eyes and examine her body language and the words she responds with. If she knows that you are not telling the truth it will be hard for her to react normally since she'll assume this is some sort of trick and she won't know how to react. If she's guilty, she'll become nervous and not really know what to say. If she's innocent, she'll say "See, I told you there was a logical explanation!"

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn