Treat others on how you want to be treated. Make the first step by starting to show concern to others.

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The above is what others say but my case is the same as yours. Thankfully, I have gone through the down period & the me today mostly just don't give a damn anymore. I no longer participate in any of friend gathering, meet up, group, chit chat, wedding invitation. I just mind of own business, do whatever I feel like doing & I expect nothing from people around me. I feel lot better that way. If my friend come to me and ask for something, I give. They call I asnwer, they text I reply. But that's about it. You'll feel miserable if you expect something from them.