dating, crushes, frustration. help!

emma • musician & mua
So this guy that I liked a while back texted me yesterday being all flirty and everything. He kept telling me I was pretty and gorgeous and using 😍, 🤤, and 😉 emojis. He's not a fck boy type and is one of the sweetest guys ever. I still have feelings for him because he is one of those crushes that never went away. I texted him today and he has barely replied and acted like nothing happened. I really like him... what do I do? Why is he acting like nothing happened?