@is she cheating ,
is she cheating wrote: I love her and do not want to just walk away.
She has told you she loves you .
If you don't believe her, you have to decide what to do. You can talk to her more. You can talk to someone (a counsellor/priest etc) about why you continue to be suspicious after someone has confirmed their love for you. You can ask your girlfriend to go to a counsellor with you to talk about your concerns and what you can both do about it. You can break off with her.
We don't know if she is cheating.
You don't know she is cheating.
You started watching her and her contacts for some reason that only you know.
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If you were my real-life friend, I'd suggest turn off your own social media accounts at this point and just try to live your life. Focus less on what anyone else is doing on social media. I would also seriously encourage you to seek counselling for the two of you if you are considering continuing in the relationship.