Help! This lady wants my boyfriend!

🌟N
This "woman" sends my boyfriend snaps saying how she loves him and blah blah blah. Its so annoying! To make matters worse she's 9 yrs my junior, very pretty and fertile. Before we dated he used to mess around with her. He doesn't anymore, but they still work together and have mutual friends. Should I be as insecure as I am about it? He shows me everything and we laugh about it together.