Dear Readers, I Am Confused My Girlfriend Is A Flirt But I Still Love Her

I have been dating my girlfriend for 3 years but she still can't pick calls whenever am around her.Recently I saw a message on her fone where she was exchanging emotional messages with her Ex.she assured me there was no cause 4 alarm but I know there is more than meets the eye.The sad part is that I still love her so much that the fear of losin her sends jitters down my spine.