He's sending mixed signals. I'm confused?

I've had a crush on this guy for the past few months. If I go into complete detail this will be a whole saga. So I'm gonna shorten it big time. We met back in September through my best friend (they're cousins). We clicked right away and were comfortable with eachother since the first time we hung out. When we first started talking it was really obvious he liked me. We texted all the time, he started the convo most of the time, and he flirted all the time. Then we started drifting (we go to different schools but live like 10 minutes away).So skipping forward to recently. We went from snapchatting (iphone app where you send pictures back and forth) like every night to no contact for a week. So now we haven't talked/snapchatted in over a week. I decided to give up until he puts in effort. I figured he didn't like me anymore or something. Well last night I posted a picture of myself on instagram and he liked it. That's the 3rd self pic of me he's liked.

I don't know if this means anything or not. I know a lot of my guy friend's liked the picture as well. But since me and this guy had a thing. I don't know if it's different. I'm just so confused. His birthday's next week so I'll wish him a happy birthday. But other than that I guess I should keep waiting for him to contact me.

I think he still likes you, I would tell him happy birthday and bake him cookies! Go on foodnetwork.com and get the recipe for monster cookies! He will adore you for those cookies. A way to a guys heart is through his stomach! Best of luck! Could you please answer mine?

Two strong possibilities - maybe he is shy and waiting fr you to make the first move, or he is a big time flirt who just likes to hang out have fun, make out and stuff because he used to flirt there's strong possibility of latter, try to get him more about his past relationships, is he well mannered, chivalrous or nt, but trust me i'm a guy and at the end of the day every guy is looking fr one thing only. So chose wisely

This is CRAZY because I really like this girl and even though i'm the boy I will NOT text her until she does first it can be like a week and i won't text her. And me and her will talk for like 1 or 2 weeks when we start texting. So don't think he is uninterested because I sometimes don't text the girl i like for long periods of time. Maybe he doesn't wanna talk first because he thinks hes annoying. Or maybe because you guys have been talking for a long time but hes scared you just want to be friends. Do NOT think he doesn't like you! Because i like a girl and don't talk to her for about a week because i'm afraid ill get annoying and maybe he feels the same way!