i am not gonna say: follow what your heart says coz this sounds a bit unappealing to me. be practical coz that's what you need to be at crucial time/events. if you were 17 i would understand, but you're 28! she still must be quite young so it may not look like a problem right now. 10 years down the line, you will be 38 (still young) but she will be 51!...as per my experience, girls look older all of a sudden after 45 or so. then, you may be repenting over your decision. if i were you, i would take time before committing anything. after all, it's the matter of two lives. when you cannot be happy, she cannot be happy either. see, if even after 2 years, you have same amount of passion and love towards her. i bet, you will get the answer yourself. good luck