worried trouble might start

been with this girl for 2 months. i am very happy with her. this girl i was seriously talking to 4 years ago(we talked alot then she cut off all contact out of nowhere) messaged me on facebook 2 weeks ago. we chatted a bit and she asked about my girlfriend. i told her i was taken and was very happy. she asked "should you be talking to me then?" i said "my girlfriend trust me, i'm not doing anything wrong" well i sort of have a weird feeling she might message my girlfriend and try to start something.

i know some people will say why talk to the girl but i did enjoy talking to her.i'm not talking to her alot. maybe 1 facebook message a day. should i just tell my girlfriend about it or not?

if your not doing anything wrong then why are you so worried?? keep the messages for proof that you were just being polite/friendly.. and stop talking to her if you think your gf wouldnt approve.