help my friend with a suggestion?

she has been talking to this unpredictable guy.. yes he is.. as we are very close she tells me everything.. and he talks to her very well in texting. i have seen their conversations too.. but when he sees her in college he tries to look away or not pay attention to her.. she is really confused because she loves him.. and she wants to know whether he has interest on her.. sometimes we feel like he is not paying attention just to make her jealous.. and he talks to her as if he is really interested in her.. and sometimes they both talk to each other in college for few mins.. but sometimes he tries to neglect her though they dont have any fight.. we cannot predict what is in my mind as he talks well in the time as well as neglecting..