Situationship

My friend and I have been in and on and off situationship for 4 years. I’m going to try to make this long story short. We first met in college and we were dating to get into a relationship. We became disconnected and I got into another relationship, which didn’t last. We always vowed to put our friendship first though no matter what. Ever since then, we just date, have sex, talk about getting married and having kids. We have such a great bond. We do relationship stuff, ofc without being in a relationship. A lot of the times I break it off because I can’t keep doing it if anything isn’t coming out of it and he understands and we remain friends. We haven’t messed around with each in a year because I broke it off last year around this time. I can tell he is starting with his ways again by certain things that he say to me. I don’t want to feed into it. For example, a couple of our college friends have had kids. He will joke around and say that we are next to have a baby. It makes me feel some type of way because I feel that he only sees me as a babymom and not as a wife, let alone girlfriend. (I know he values family because his parents are still married. I know he wants his wife to be the mother of his children. So I don’t know whether to be offended or take it as a compliment.) What mainly makes me upset and makes me protect my feelings is, I don’t get why he doesn’t want to be in a relationship with me. He has never came out and said that he doesn’t, but actions speak louder than words. Like I said we are close and he told me that he wanted a gf a couple of months ago and that he was talking to somebody else. My fear is I don’t want to start up with our situationship again. He will start to want a gf (not consider me) than get in a relationship to someone else. I feel if this happens my feelings will be extremely hurt in the end. I don’t want to feel like a back up plan or something he get comes to when he gets bored. Also, I think that he is in love with me and I confronted him about it. He didn’t deny it at first. Eventually, he started denying it. I don’t know what I should do. I tried to talk to him before, a couple of times, but we never get around to it.