<human>: Hello Reddit.  Pretty odd dilemma on my hand right now.  Last night my ex girlfriend who I am "working on things" with randomly got upset at me.  It just so happened to have occurred about a hour or so after a girl I met this year in college like two very old photos (a year ago) on my instagram.  I had my hunch about it and kept asking her to tell me why she was upset.  I day later of her saying "drop it it's nothing" (which isn't like her, she usually likes to really let me know what is wrong) she finally admits that she was upset because of that.  
I put the pieces together and she in turn knows EVERY single thing that occurs on my instagram, from a new follower to pictures I like all the way to the people who like my pictures from a year ago.  I ask her how she knew all this info and her answer is "I don't remember".  Which to me is already enough evidence because I highly doubt she stalks my instagram and checks every photo daily for a new like. I am a bit stupid and have told her that my passwords are all generally the same thing, which is my pets name.  So it is very plausible that she has my passwords.  What do I do?  She won't admit to it but I feel like she does have all my passwords for social networks.  Do I confront her or let it go?  I really bothers me because snooping is something I don't dig.

Also, the reason we are working on things is because she is very jealous and can't handle the fact that I have made new friends in college, especially female friends.  Also she has a history of snooping through my phone and Facebook so this seems like something she would do.

Can you condense the text into a few key points?
<bot>: I have reason to believe my ex has my passwords for social networks but she won't admit or deny anything.  What do/can I do?