In the evening, I chatted with a female colleague by SMS. I hinted that I liked her, but she said we couldn't, and called me buddy. Can I have hope?

I hope there should be. Obviously calling you brother means she wants to draw a line. But the boundaries are in your hands. To put it more rustic, if you sing her love songs every day, her heart will not move because her boyfriend is away. You can touch her from the aspects of detail care and true feelings every day. Come on, within three months, as long as (your method) she doesn't hate you very much, you will succeed.