He liked my picture after I liked his?

Me and this guy have known each other for a while. He's 21 and two years older.. anyways we get a long pretty well, kind of like friends with benefits right now. Just hanging out and hook up basically. We're both really physically attracted to eachother,

I'm pretty active on Instagram and he barley posts any pictures. I kind of have a crush on him but I don't engage with him on it or anything. He's liked a few of my pics a while ago but not recently, maybe because I haven't liked his haha. Anyways I decided to like one of his pictures he posted today and like 45mins later he liked one of my recent ones mine back..

Is that good sign or is he just being nice?
He liked my picture after I liked his?
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