I don’t really have any tips either but I want to acknowledge your question. Again, for me, it is a symptom of mania and can be spotted a mile away. I start talking about the person incessantly and doing whatever I can to be near them. In the past (namely when I was young), I have just seemed like a leach but as I have gotten older, my husband has tried to keep tabs on these situations. He has, in the last few years, really stepped up as s caretaker for me when I am very unwell. He does what he can to minimize my contact with the person and does his best to make me aware that is is an unhealthy obsession and nothing more.