Check the date of the picture and If the picture is new, he's probably cheating, or decided to stay friends with his ex...ether way how did you find this without him telling you or you going though his phone...you obviously have trust issues to start with.
"I saw a photograph of my ex-boyfriend with your girlfriend" Vi una foto de mi ex-novio con tu amiga.
he might be stepping out on you
Of course you should. Jealousy is for the immature and children
It means the ex boyfriend still likes the ex girlfriend.
If he is your ex and has obviously moved on I would wonder why he has your phone to begin with. Get your phone back or cut the one he has off - cut all ties with him and move on just as he has.
be yourself
She probably did it to make the ex- boyfriend jealous.
she wants to keep her options open with him.
He had a girlfriend. Her name was Kasey. They are not boyfriend and girlfriend anymore.
If it is an ex-boyfriend, then it shouldn't matter...right?
no, Because your the boyfriend and he is an ex only.
there is not much you can do you just have to get over them both