Making a choice

I am married. We are content. I want to be more than content. An ex recently came back into my life. I have allowed him to say things to me I shouldn’t be listening to. He thinks we are soul mates. In some ways, I agree. However, I don’t want to hurt my husband. I’m looking at this and is hit me: I’m trying to change my level of happiness with someone by changing the circumstance. My happiness is in me, not who I’m with, right? That’s the work I need to do – deciding to be happy regardless of who I’m with?