Confessions: Six years and two children later, I am yet to meet his parents

I have been in a relationship for about six years and I have two children. I am starting to get concerned about our relationship because he has never introduced me to his parents for all these years. The only person I know is his sister even though we don’t get along very well. My main cause for worry is that he refers to me as his wife to all his friends but has never even suggested going home to meet my parents to discuss dowry or declare his intentions. There are rumours he is seeing another woman and is even planning to take her to meet his parents. My sources also tell me she is pregnant even though he denies it every time I ask him. I am stressed and my instincts tell me he may be serious about her and is only buying time. Please advise me on what I should do.