Should I tuck tail and go, or stick it out?

Hannah 🌻🍄
My SO and I had the talk last night. We had gotten into a bit of a disagreement we both said things apologize, he ended being later for work and left. (Side note: very good friend died and I wasn't dealing well, he left a fiancée and two kids- it made me start thinking, He was 33, 4 years older then my SO). I texted him here and there though out the night. He told me how much he loves me and he wants to marry me(oh that's great). He then asked what if we did it tomorrow, but I'd rather wait for something special. Started talking about how there's no real right time. He got home after dinner we sat out side and talk it over and confessed to be he doesn't believe in marrige or its ideas (wait hold up!!) He said goon on about its just a piece of pair an he doesn't need it to show that he's committed to me. So asked him you wouldn't care if we got married or not and he he said yes. I was kinda hurt I tried sharing how important the idea of marrige is and he said  a wedding is jut showing everyone that your choosing to comment to this one person and Ed have one for me. He says he wants to marry  me but he doesn't believe in the ideals of marriage . He's seen a lot of failed and unhappy marriages. His last long term relationship he had bought a ring and was goin to propose when she   Left him. He's a very blank person when it comes to emotions for  feelings. I love him as he loves me but I can't shake this, I know he's the one but suddenly I'm second guessing is.