I think joking or teasing possibly, if he uses emoticons a lot, that might be sort of a text version of his interested body language you'd see in person. The frequency of the texts and how quickly he responds to them may also be a factor in showing his interest, as well as if he seems happy to carry on a conversation and continue texting with you.
The ones who were truly into me wld text me every morning and night no matter what.. But they would randomly write cute litte ;) texts to let me know I was on his mind...
Signs through text that a guy likes you?
What are things a guy will do through text to show you he likes you? How frequently will he text you? Etc...Thanks :)