To people who think love is a real thing, then as 1 John 4:16 says that God "IS" love.
Love is a somewhat ambiguous term, but like all human feelings, it's the result of the biochemical processes of the brain and body. Much of it is concerned with pair bonding for breeding purposes, and with the offspring for their protection till they become independent, and with grandchildren consequently. There are also evolved tendencies for the welfare of one's family more broadly, for your friends and associates, for your district, and other groups larger still with which you may identify.
Love to me is a concept because of the Bible's concept or definition of love is found at 1 Corinthians 13:4-6.
I have no objection to 1 Corinthians 13:4-6, if, as is appropriate to any aspirational statement, we add a requirement of common sense.
To me, Jesus is a real suspect because through Jesus' teachings one can determine whether there is a God or not.
But there's no meaningful definition of a real God anywhere in the bible. Certainly not Jesus, who whether in Paul's version or the versions of the authors of Mark, Matthew, Luke and John, expressly denies he's God.