If she photoshopped the pic, they must be talking with each other. And if they're talking to each other, they must be making out. And if they're making out, they must be... Or maybe they're just friends and she thought it would be fun to do this for him. You know how friends help each other out.
That's reading in to things way too much. They are most likely just friends. If one of you asked one of your guy friends to photoshop a photo of you for you, would he be insulted? There's probably nothing going on. If more stuff happens tho, then you may want to talk to him about your concerns.
Do nothing. It sounds as though they are friends and nothing more. If it bothers you ask him. Also maybe you can get to know the girl...might be shocked to find out she is nice and a great friend. My opinion only. You don't want to over react to some thing so innocent. :)
I don't know what you mean what you ask what do you HAVE to do .. You don't HAVE to do anything. She may still harbour feelings for him or she's messing with you, or it's just a photo of someone she used to like.
In any event ,as long as HE is not encouraging any inappropriate attention .. don't worry about it.
I know how you feel but i am old enough to tell you simply Girl! Hold it up together! it's not a big deal as long as you trust the guy and know that he won't low himself to these sort of actions. After all who told you this picture was edited by her! it was him, so he is keeping you in the loop, that's a great sign ;) PLUS WHITE!! come on he would be an idiot if he choose anyone over you sugar ^^ Lot's of love and hugs :) <3