Am I his back up plan?

I dated this guy for 3.5 years, we were engaged and planning out wedding. I ended up losing my job and he moved out of state for work and I moved in with my parents We kept things going for a few months and then called it quits. We started talking again a few weeks later and things were fine, then one day he tells me its over and that he has always been in love with is ex(who he dated before me. him and i met about 6 months after they broke up). Ever since then we have been in frequent contact, this was about a year ago. I stopped communicating with him because I felt it was unhealthy for me. A month went by and he contacted me to tell me a guy I met once 3 years ago died. So now its back to the every 2 weeks we talk for a couple days. He recently asked me if I was single and I said yes but I talk to this guy every once and a while he then proceeded to tell me about how great his relationship is and how its the best he has ever been in and (again) how he has always been on love with her. A couple weeks ago, he told me how his relationship is hard and they do not have enough time for one another. Then asked me when I was going to move out of my parents house, I never mentioned anything about moving. Fast forward to now and he contacts me to ask what's new? I don't get this guy. If he is so happy why is he still talking to me and initiating the conversation. Is he just trying to keep me hanging around as a back up plan??