My ex boyfriend asked me if I'm dating this guy...?

[Lucy]

My ex and I are broke up a year ago after 4 years and 3 years living together. We're very good friends still as we had a nice break up and it was common thing. I have lots of male friend but still much single which I like and enjoy it. So he saw lots of photo of me and the same guy on Facebook and seeing we're out together having dinner etc...
He asked me if I'm dating this guy and I said he's just a friend so no. He voice got so happy all of the sudden and he carried on talking about something else straight away...
Do you think does he still like?
Yeah I mean he's always been there for me after we broke if any problems! But it's crazy for me to know if he still likes me after a year! God no! I really would love to have him in my life as friend but going back with him would be unfair to him as I'm not in love with him anymore...
We had 3 years amazing time together thou but the last year of our relashionship was kinda hell...