I don't think it is love itself but the lack of love among people that is the root cause of heartache and pain. Love is a perfect bond of union.
"Love is long-suffering and kind. Love is not jealous, it does not brag, does not get puffed up, does not behave indecently, does not look for its own interests, does not become provoked. It does not keep account of the injury. It does not rejoice over unrighteousness, but rejoices with the truth. It bears all things, believes all things, hopes all things, endures all things. Love never fails."