I think the meaning is pretty clear. This person got really burned in a previous relationship, and because of this is unable to love and show care in his present one, even though he so badly wants to. It's lovely song, and very sad. You can really feel how defeated and frustrated he is with himself.
@ladyfrommars That is exactly my interpretation ,he wasted all his energy on \'another love\' and now he\'s unable to give off anymore to his new partner
@ladyfrommars so true