Help on this ??

How to deal with this? Married for 15 years with 2 kids with H. Girl name M M was ex colleagues with H 15 years ago or more. M was warned by me to stay far from H due to H decided to be with me and marry. He does not want M to came in-between us. H only treat M as friends. But M take for granted and rely on my H. Will seek questions or help from him regardless on any issues or matter that she cannot decide This actions stop for a few years that did not disturb us. Recently my 6th senses kick in very strong. Saw the message on the phone that M send to H. She will asked a lot of questions regarding to herself or about him or even try to dig information on H to see how am I like and comparing herself and me. I not sure why she wants to do his after 15 years later. Am I being over sensitive or.