I think you should take a break from this relationship and spend some time living life and growing up. He is at a different point in his life.
This, and OP - just my opinion, but this is why living together with a guy before marriage isn't wise. It creates a false sense of connection, and makes you 'feel' married, but you're not. If you're seeking marriage, that is, Not all people are seeking that. But, a guy isn't the head of the household, if he's not your husband.
Think you should move on from this one.
You asked if people have dealt with a break up, and yes I have...I recently was engaged, and we broke it off a few months back. Ironically, he wanted to buy a house with me before we officially got married, and I didn't want that. I started seeing a side of him I didn't like, and we both decided to part ways. I'm dating someone new now, and we just really respect each other in a way, that I haven't had in other relationships. You'll get past this, I'd go no contact so you can heal. That might sound harsh, but to stay in touch with him will not help your healing process.
Best wishes for your journey.