Always the girlfriend...never the wife

I have been engaged for over three years and in the relationship for a total of six years (approaching seven). He proposed and even bought a wrap for the engagement ring however the committment level is nearly null. We live as room-mates primarily. He sleeps in our bed when he wants, but mostly sleeps in the guest bedroom. He is very interested in his own hobbies and friends and rarely includes me (not that I mind because I too have separate hobbies/friends). I have a child and he has a been a big influence in my child's life. However, I feel that he doesn't plan on marrying me. Recently we went out on the town together and he disappeared only for me to find out that he was in a hotel. Secondly, he has been contacting his ex-wife frequently (they do not have any children together), and he states that they are only "friends". The "friend" status between him and his ex-wife includes any maintenance around her home, or any questions she has (supposidly). I understand having a cordial relationship with an ex-spouse however not one that includes over 10 phone calls a week (the phone calls are made only when I am not around). I would like to add that I was not searching for his mistakes, but happenstanced about them when checking with an issue with the wireless carrier and an increase in the bill (he used all of our joint minutes and went an hour over on his line). I am younger than he is (by nearly 15 years) and I feel as if it may be time to move on. I have attempted discussing these issues with him, but he really doesn't respond. I almost feel like another piece of furniture in our home rather than an individual person, a girlfriend, or potential spouse. So any thoughts would be greatly appreciated. Thanks in advance for reading my drama.