Girlfriend on vacation

Anonymous
I've been with her for over a year. And for that year, I never saw any infidelity, like out with other men stuff like that but well.. Except for Lie's about what she did. I want to trust her... But I'm having a hard time.. Am I just being insecure, or is this just an instinct coming from a guy who went through that "Getting Cheated on" scenario already.

So My girl is on Vacation in Europe. Before she went there, she told me that her Ex-Boyfriend lives there but will be going to New Jersey. So I believed her...

1st day of her vacation we talked over the phone about how it is over ther. 2nd day, same thing.. 3rd day samething... 4th day, she told me she's going to a different city with some friends to meet up with old friends... and so on... 1st week on her vacation, I called her and asked jokingly.

Me: "So did you meet your ex-boyfriend there?"

Her: "Yeah, I'm with some friends right now... Ill tell you later"

Me: "oh, ok.."

Me as Me.. I let my loved ones be independent, I don't like caging them and telling them no lets talk about it now... Plus, she's on vacation, I don't want to ruin it for her... So I waited for her call... And she didn't call.. I had to texted her if she's able to talk. and then we talked...

She was basically telling me nothing happened. She and the Ex just talked and stuff... So I believed her.

Couple days later, She called me and I was glad she made an effort... Then she started telling how she's frustrated how her bestfriend keeps avoiding her... So I told her, maybe he has a girlfriend... THen she said yeah, but she's in greece... Then I said, maybe his girlfriend doesn't want him to go out... Then her reply shook my world... She said "well, She's not gonna know if he went out".. I was like, "Wow, that's not a good way of thinking things" and then, she started telling me that her girlfriend knows he goes out because he posts it on Facebook... which doesn't made sense to me anymore. she said "she's not gonna know if he went out" and then "his girlfriend knows he goest out"...

Am I being paranoid? Is this "Getting cheated on before" mentality kicking in even though probably my girlfriend hasn't done anything wrong?

I don't know what to believe... My brain, or her. Advice please.
Updates
+1 y
I guess the "She's not gonna know if he went out" that she said bothered me... Because the ex-gf that I had said a similar phrase like "what mama doesn't know won't kill her" and that ex-gf Cheated on me. Me thinking, what she said, is how she thinks..
Girlfriend on vacation
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