You're both really young and he's just coming out of a failed marriage - honestly I'd be more concerned if he was thinking about marriage again already.

When I met my H he was divorcing (a lot older than your bf though) and was set on never marrying again. Things changed as the relationship evolved, we've been together over 20 years now and have a kid together.

I should add though that my attitude was different to yours in that in the early days I didn't particularly want marriage either, I wasn't as forward looking as you and just wanted to have a good time.

It may be more important to you to have the shared goal of marriage even at this early stage, I guess it's for you to decide whether that's a deal breaker for you.