Tired of being frustrated with bm

I have been with my bf for almost 2 years. I have made many attempts to be friendly with bm but she has literally looked past me like I’m a ghost for our whole relationship. Her kids know she doesn’t like me and it shows in their demeanor. And when I’m with my bf she walks right by both of us without saying a word. But when it’s just them and say I’m pulling in from work I can hear them talking like good friends about work, mutual friends etc. I tell him it makes me upset because I am almost suspicious of something even though I feel secure with my relationship. Anyone else have similar experience? Thanks