How can you tell if your girlfriend is cheating on you?

I guess you will never know the real truth. The best thing to do is to think about the past. Has she changed at all since you think she has started cheating on you? Is you relationship still the same or better? If nothing has changed then I doubt that you have anything to worrt about. If you are still worried then just talk to her. It is better to be up front and honest. If you don't have trust in a relationship then i feel that the relationship is not very strong to start with. If you feel there has been a change in your partner just sit her down and tell her that you feel that the two of you are not as close as before and try and find out what has changed and why. You might be reading too much into the situation but then again you don't wanna live a lie either. You have to do what ever make you happy and at ease. I hope this helps you out.

If you have a doubt on your girlfriend you better discuss it personally with her .Maybe you doubt is just a mist . Dont value any one from what others says. I have seen some response to this discussion that you check if she has changed from what she was before. If you hear this iam sure ,even if your girlfriend has not changed , you will have a feeling that she have changed a lot.Everyone changes a little over time . So i have to tell you onething , you should better open your heart to her . Only open hearts solve problems.

first you don't draw conclusions. what is it that makes u think she's cheating? don't you feel that you should discuss what it is that concerns you with her rather than trying to read something underneath it. i think it's time for you to really look at your relationship with her and decide what it is you want from it. formulate your thoughts and talk to her without accusing her. there must be something that is leading you to believe she's cheating, if she's not around as much ask her why, don't assume there's someone else. if s3x is different then ask her about that, again don't assume there's someone else.