<human>: Can you condense the text into three sentences or less?

Hey Reddit, I'm in a long distance relationship and yes there is an age gap.  My g/f of about 9~ months was recently contacted by her ex and are now trying to start up their old friendship again.  I didn't have problems with this to start with but did express my concern and need for open communication.  They were friends for a long time before dating but their romantic relationship ended 1 year ago.

I should mention that I was the "other guy" for a while as she had feelings for me while still being with him.  It was complicated but she broke it off with him and we have been dating since.  Now he's back in the picture and I feel like it's a bit disrespectful to our relationship given the way we started and how it's gone so far.

She saw him without telling me about it until after the fact even though another friend was there.  She hasn't told him she is in a relationship or about me either.  Just today I got upset because I saw she was on Skype and playing games with him.  She says its innocent but our relationship and history is just way too complicated for that explanation to put me at ease.

What do I do? Am I being controlling an overbearing? I don't have a problem with them being friends... I do have a problem with deception, not being kept informed, and feeling like that "other guy" again.  I thought it would be more of a casual kind of thing... but it's more like a week on they are messaging everyday and he's asking her to lunch etc.
<bot>: g/f is starting to talk with ex b/f again. hasn't stuck to our boundaries and I feel like it's straining our relationship. what to do?