Does my bf still have feelings for his ex?

First year we went out, he never really liked any pictures of me on social media nor posted anything. He told me he wasn't much of a social media person and I believed him. After having some doubts later on, I looked through his phone (I know that was bad) and saw that he liked two pictures of his ex about 6 months ago and has repeated searches for her name. They haven't been together for the past 3 1/2 yrs. He has liked pictures of other girls as well (in bikinis and such), but refuses to like any of mine. We are long distance so I figured social media is a good way to feel connected. I confronted him about it. Said he has no feelings for her and that he was just being stupid. So I asked him to cut her off on social media. He seemed so hesistant but finally did it. My gut tell me something is up.