Fellow Christians, where in the Bible can I look to for help with my recent lack of love for others?

I feel like I am losing the love for people that I normally have. I used to love helping people and listening to them. Lately my heart feels hardened, even towards my family. I no longer have a desire to help those around me. I feel numb all the time and I don't know why. I have no desire to be near people at all. I used to not be this way. I want to love my neighbor like Jesus commands, but I can't bring myself to do it.
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