Does my girlfriend have a backup guy?

Anonymous
Okay so currently we are in a LDR but she visited recently and went back to her country,

before that she met this guy or whatever started calling him her best friend and she sometimes posts chats between him and her mostly having heart emojis ( not sure if that is to make me jealous )

but, before she left we were on a small date and we were kinda messing around and checking each others phones i gave her mine with no problems and when i took hers i said "lets see which app should we check first" as a joke and i started checking her apps just like how she checked mine

Then when i came to their chat she got so paranoid and took the phone away and she asked me what i wanted to check and i asked her why she took it and she said that there is private information - well my phone has private chats too - and that got me curious i feel like she is hiding something because she never introduced me to this guy and never said where they met or whatever.

Then i just got over it. then a few days later I thought to myself... why does she still talk to this guy? I think part of it is boredom (a big part), but the idea hit me that this guy is sort of a "backup guy". She may not even consciously realize this is why she keeps talking to him, but on some level I bet that is one part of it.

What do you think? I got sort of pissed off thinking about it this morning.

Anyway... there is nothing I can do about it really. I don't believe in telling others what to do or not do. It just made me a tad less secure in our relationship. Sort of created a little emotional distance on my side.

Am I paranoid? Or is there some truth in my analysis of the situation?
Updates
+1 y
Guys what we can all agree on is that there is something she is hiding and i need to know why?
Does my girlfriend have a backup guy?
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