I have a feeling my girlfriend is cheating on me ...

You can ask her about it, but be aware that she may deny it.

If she denies it, you can either trust her and take her word or you can try to get proof that she's lying and cheating on you.

Only you will be able to read the signs. Here are a few (there are lots of others, and the presence or absence of these does not mean she is cheating for sure):

Has her sexual appetite changed significantly? Is she secretive about phone calls or emails? Does she spend more time out doing her own thing, when you used to hang out together? Has she changed her mode of dress or bought new outfits, yet doesn't wear them for you?

If you discover that she is cheating, I'd suggest you call it quits and look for a new girlfriend.

Apparently you are getting signals that make you think she is cheating. It is causing you stress. Stress is bad. Find a gal that doesn't stress you out and be happy. If you continue to feel like every girl you date is cheating on you then you either are dating the wrongs girls or you are just insecure. Good luck.

Not enough information but it boils down to the main choices being one of these:

a.  Put it out of your mind if it's only speculation; it might just be your imagination or insecurities.

b.  Ask her and discuss it and see what she says.  Make it an adult, calm discussion ... NOT a good time to fight or accuse.

c.  Follow her or check on her (or have somone do it) to see if you can prove or disprove it.

d.  You could inquire of others (your friends or hers) but this is VERY DANGEROUS because if you are wrong and she learns you don't trust her and went behind her back asking this kind of "stuff" ... she mostly likely will be telling you to "TAKE A HIKE" and looking for a trusting replacement for you.

ROB