Search Results: flirting or just being funny

This story has been making me think a lot. So I flirted with this guy a few times on social media. Like one time I complimented him one time under a picture on his Instagram and he wrote back with only a heart eyed emoji. Another time I tweeted him and mentioned something about him not being hot in a joking way under a funny picture of him and he retweeted and favorited it. Then a couple months later I saw him at a concert and I went up to him and he looked at me but he looked away and continued talking to another girl. He kept turning his head straight at me and looking away. When the girl left, he walked over to me. He looked at me with his mouth slightly opened and his eyebrows a bit raised and his eyes looked a bit bigger than usual, but he didn't smile. We held our eye contact for a good 4 or 5 seconds and then he hugged me and said "hey" and I said hey, while i was hugging him and he walked away quickly without saying bye or anything. That gave me mixed signals because we could've talked but I think he got scared or had to go to the bathroom. I asked my friend, who was next to me while this all happened, if she thought he was attracted to me and she said there was something definitely there. And just recently, he posted a photo of himself on Instagram and I said, "damn you make me want to knit both of us matching sweaters." and he responded a minute later saying "I'd wear it." I'm thinking, alright he's flirting back with me, but does he like me? What do you guys think?

Guys, I can't tell if he likes me or not?

Ok so about a month ago I met a German guy through mutual friends whilst my sister and I were in Germany. As a group we spent an entire week together, and he was really flirty - making me laugh all the time, teasing me, etc, and there were the stereotypical looks, deliberately sitting with me and so on. Then on the last night we knew we were going to see him before going home, he did a total u-turn. He was passive, grumpy and totally non-responsive to any teasing or flirting I initiated. We're friends on facebook, and I've messaged him a couple of times in an attempt to start a convo or mentioned him in funny comments etc, but he's being really blunt and either not responding or just giving me one word answers. I really like him, and I thought he liked me, but now I don't know if he even wants to be friends. What does everyone else think? Is it worth pursuing for what was there? Did he even like me in the first place?