It depends on what you mean by "on". 

He's really busy or he just do not want to see you. please forgive me for direct answer. I think if you have special feeling with him, you can talk to him and then do a choice!  You are a excellent one! come on!

I agree with Sophie. If you are interested, you should talk to clarify the situation, that's the best option. If any of you are being directly, then it's hard to know what's really going on between both of you.

If it's making you feel so sad you should talk to him/her and clarify the situation.

对你失去了信心和耐心。

That’s all.