My boyfriend has two kids, a 10year old boy and a 6 year old girl. They are  sweet and nice kids. My boyfriends ex tells the boy that his dad doesnt care for them and love them bcus he only sees them once a week bcus he works alot and on his free days he is with yhem one day and with me the other. I get along well with the kids but lately his son doesnt talk to me bcus of his mom. She puts things in his head and makes him not want to talk to me. Im sad he will stop liking me and i want to get more along with him. What should i do?