Should I like his picture?

I had a thing with a guy a month ago. He was super into me, but a little shy. I met him through friends. They told me he liked me, and had to push him in to making the first move on me on a night out. We kissed a few times. Hung out once. Texted for 2 weeks. Out of nowhere he ignored one of my texts, and 10 days later texts back. F*ck knows what happened in those 10 days, but i thought he had lost interest. I acted completely casual and cool when he suddenly re-texted. Even though he initiated the convo, his responses were super short and made me feel like he didn't feel like talking. (I know I shouldn't read too much into guys texting habits, especially that he works and is really busy, but still..) So I cut the convo short as well, and we just never texted again. That was 2 weeks ago.
BASICALLY I have no clue what he's thinking, I know that i'm still interested, but obviously our thing is over... At first I felt super sad. But now I've come to terms with it. I'd actually want to be friends with him, not just ignore or avoid him awkwardly. We have many mutual friends and ALWAYS see each other out. Should I act completely normal when I see him?
He just put a picture on instagram, and I want to like it. Will that be weird, and he'll think i'm still obsessed with him? From my end its just a casual like..
Should I like his picture?
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