I know that feeling of "all my love" and have felt rather cheap with it as I have four partners. I decided long ago to say it anyway. To me saying someone has all of me in any way (all my heart, all my body) means they have all my attention in that moment and that they have all of their place in my heart.
I love each of my loves so differently. I can't compare one over the other so my love is different for each. Besides, in the moment I say it I am totally being true to the words and to my feelings. It means I am bursting with the joy in it and handing my heart over as a gesture of trust and vulnerablitity that it won't be broken or abused. I also have been known to say "I am giving you all the love I've got right now."
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