I say go for it... I can honestly say that there is a girl I have felt the same way about since I was 10yrs old. If I could marry her I would do it tomorrow and thats after not seeing her for 10 yrs.
I would take the chance because as you are aware life is short and happiness is far a few between. If you love him and there is no doubt he loves you. DO IT.
Live with passion and love like you've never been hurt. Good Luck to you both.