So... yeah

I happened to tell my sister that I got a message from a client I worked with almost a year ago, saying he was grateful for my services and would like to stay in touch. Since he is from my community and all that, sis teasingly said, "oooh looks like the coast is clear for something more." I was serious and I told her, "Nah, I'm not interested. I have my eyes on someone else right now." And she rolls her eyes and says, "Gosh, are you kidding me?"
I told her about the boy I like many months ago. Even then, she just laughed it off. And when she saw I was genuinely hurt, we had a mutual agreement not to mention it.
But I don't like it when they pretend my feelings don't exist or they make light of it... or they kinda give off the vibes that nothing's going to come out of it.