When Alfie started that sentence Julien was pretty sure that the Hufflepuff was laughing at him, but then it ended up with a compliment so Julien was completely turned round. He wasn't sure what to think so he gave Alfie the benefit of the doubt and believed the other boy, causing him to blush a little and look down, bashful.
"Uhm n-no, I have time." he stammered. "Just didn't want to, you know, and then you would-" he started again. "I just wanted to be upfront with you about it. In case it changed your mind." and he offered Alfie a somehow self-deprecating smile.