OM SAI RAM
In this day and age where instant gratification is the norm than the exception, we forget Baba's teachings which is nobody can make us happy, only ourselves. Even if you are in a room full of people but your heart is hollow, you might as well be alone. But if your heart is full and the love is the unconditional love for Sai Baba, I believe you will never feel alone or sad even if the burden of daily life weighs heavy on you. Human love is not eternal. It is as fleeting as the passing cloud but God's love is eternal and never changing. As for "friends" who use and abuse you, remember a story in Sai Satcharita, Baba said even if a beggar comes to you and you are not incline to give any monies etc, just decline politely no need to be vulgar and rude! So, if you know a friend has a history of using you than forgetting you after that, politely decline to help with a smile. They can't back stab you as you were not rude. See there is so much we can learn form Sai Baba...even his teachings is applicable in modern life now.
Jai Sai Ram