is my ex boyfriend/baby dad using me?

I'm currently 37 weeks pregnant and Me and baby's dad broke up a couple months ago, and it's was quite nasty at first, but recently we've been getting on really well. He wants to be involved with the baby which is great. 

HOWEVER he won't tell people that we have broken up, so if we see people he will act like we're still together. We went into town together (after he stayed over mine to make a midwife appointment) and we walked around and he held my hands and kissed me and referred to me as his misses at one point. Then the next time I saw him he was still nice and friendly and pretending that we were together in front of people but didn't kiss me and when he said bye he kissed my cheek. He calls me every day before work, at lunch and after work just to check up, and we have a chat and a laugh.  

I spoke to him yesterday about us as I'm hugely confused now. He said to not push it and he doesn't know about us, so I asked why held my hand in town and he said because it was nice. When I asked him about us I said how much I wanted us to try again and that I missed him and I started crying so he gave me a hug, I asked for a kiss and he gave me a kiss and held it for a bit. I've now got all of my feelings back for him and I am now an emotional mess as he won't give me a straight answer to whether he wants to get back together or not. It's like he's holding onto me without having the commitment. 

I want him back and I miss him like crazy, I want to just cut him out my life so I can get over him but baby is due so soon that I can't do that and I feel so stuck to someone that I don't know what is going on. 

Does it sound like I'm being used or what, it's so annoying not knowing!