My boyfriend is flirting with my cousin,,, what should I do? (please help me)

Ariesbaby
I asked my ex bf to have another chance together.
He accepted. he is nice with me. we have awesome sex but not EVERY time we meet.
We have fun together we go to parties with my friends and his mates.
But he hasn't told me yet in words that we are bf and gf again,,, cause sometimes he acts like we are just friend and sometimes like couples.
My cousin is my bff,,,, last time we were dating he hasn't used to make me jealous but this time since he backed he is trying to make me jealous by calling my cousin : babydoll,,, flirting and caring about her very much.
He also flirts with other girls too,,,
I get very sad when he does this but he also comes and kiss me and cuddle me or seat beside me when we are with our mates,,, but he is flirting with my cousin all the time its not like he's calling her or text her,,, but every time he sees her with me he do this.
I really dont understand him :(
1. does he do this to make me jealous or what?
2. what reaction should i have to this?

Note: we start dating again since last week.
I was the one who hurt him more and i apologyzed him.
by the way iam the one who makes more contact he just respond to them and rarely calls me himself.
My boyfriend is flirting with my cousin,,, what should I do? (please help me)
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