[header] How to tell if a guy is interested in you [title] Look into his eyes. [step] If he looks back and makes eye contact, there's a pretty good chance that he might be interested. This is also a really good flirting technique. 
Holding his gaze, especially if the two of you are talking, will create a connection between you two pretty quickly. [substeps] If a lot of times you look up, and he's looking at you, that's a good sign.