Am i over reacting ?

I have been in a long distance relationship for a while. We see each other when we can but due to circumstances at present it can't be more. Weve never had any problem's, anyway he sent a text message last week that was rather odd. I didnt get it at first. Then he said that wasnt meant for me i'm just helping some woman out who used to work for his firm and has now moved abroad. Now to me the message was flirty he on other hand says im over reacting just because he helping out an old work colleague in getting jealous, Either way ive not spoken to him for a week. For me the trust has now gone but a part of me thinks maybe i am over reacting ??