Can you help me interpret this poem?

i've been reading this poem and i feel that i am not able to grasp the deeper meanings of the lines.





MORE STRONG THAN TIME





Since I have set my lips to your full cup, my sweet,


Since I my pallid face between your hands have laid,


Since I have known your soul, and all the bloom of it,


And all the perfume rare, now buried in the shade;





Since it was given to me to hear one happy while,


The words wherein your heart spoke all its mysteries,


Since I have seen you weep, and since I have seen you smile,


Your lips upon my lips, and your eyes upon my eyes;





Since I have known above my forehead glance and gleam,


A ray, a single ray, of your star, veiled always,


Since I have felt the fall, upon my lifetime's stream,


Of one rose petal plucked from the roses of your days;





I now am bold to say to the swift changing hours,


Pass, pass upon your way, for I grow never old,


Fleet to the dark abysm with all your fading flowers,


One rose that none may pluck, within my heart I hold.





Thank you!

Can you help me interpret this poem?
I don't think it's particularly deep: He spent some time with his love, and he will cherish the memory so that whatever else happens in life, he can hold to this one rose petal (his memory of the time he spent with her) and get pleasure from the memory. Is there any particular line you don't understand?
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