Engagement

I've been with my boyfriend for just over a year and a half. A few months ago we went through a spat where I wasn't sure that it was right for me but we worked through that and things have been better. Last night I asked him how he saw our life going in terms of marriage and a family of our own and it's just started an argument. He says he'd like to buy a home which is fine but he's not actively saving for one. I've had a picture in my head that I'd like to be married with kids before I was 30 and now I know that's not going to happen and I'm unhappy about that. He said i shouldn't be as that means I'm unhappy with him but that isn't the case I'm just grieving for the image that I had for myself. He said to me that he hasn't proposed because after the spat we had he's scared I'd say no..Im hurt that he didn't trust me enough to know that I wouldn't be with him if i didn't want to be. I feel any possible engagement has been ruined...how can I say yes to someone who isn't sure about me.That isn't what I want for myself..Can this be overcome?