Angry?Not angry?jealous?not jealous?

Hi all,
today I received a message from this unknown woman to congratulate me for my engagement..."congratulation because you will get engage with someone I ever know..."Hmm, quite strange the sound of that message..I asked my fiance-to-be if he knows this woman and he said..yes, she is my ex-gf...Wah!suddenly my heartbeat became faster and faster...I don't know why...is that a symbol of jealousy?anger?unsecure?...hmm.????