Is he trying to make me jealous ?

my ex and i broke up on monday and he has a new gf and me and his best mate and him and the new gf were hanging out yesterday. his friend put on ginger christmas (bec im the ginger ) and out of the corner of my eye i saw his face he looked sad for a bit then we all played cards and and he kept fling the cards at me where as he handed them all to everyone else and then wen i went to get changed and came bk over he looked me up and down and then wen his gf wasn't in the room he complemented me on my necklace and when she came bk into the room he started playfully poking her but every time he poked her he glanced at me ,