If it doesn't have a monetary value, Mei isn't interested. That goes with everything: people, items, etc. She was greedy… too greedy for her own good.

Eventually, you began to found out that she was using you for money. She frequently stole your money from behind your back, taking advantage of you for money. It made your heartbreak, made you so pissed. You needed to confront her. Right now, before it was too late.