At a bar concert

Sooo I'm at a bar concert with some friends and all I can think about is that 50% of all marriages fail. My boyfriends ex-gf is here (which is totally cool with me) and I'm sad bc her marriage is failing...my bf's marriage failed. And all I can think is that I'm 28 never been married. My previous relationship was 5 yrs long and ended badly...my now relationship feels more like forever than the other but who really knows? How do you know it's real and lasting? Or do you not and you just try? Willing to try but scared to ask of he's ever even gonna be interested in marriage again...what if he says no!? I'll be crushed! So where does that leave me? At a bar concert with the one I love and am scared to ask about our future.