Is he just using me?

I am dating this guy who only just ended a relationship with his pregnant ex back in June. Also, she left him and initiated the break up and not to mention he still texts her telling her how much he misses her, how he needs her and wants to be in his child’s life. He has even left her a voicemail while around me but he doesn’t want me talking to other guys nor does he want to end things with me. It’s like he’s stringing me along because she won’t take him back. I feel like a rebound. He acts crazy when he finds out I’m texting and communicating with other guys because I feel like we aren’t exclusive but it’s perfectly fine for him to text and call his ex telling her how much he misses her.

Is he just using me?
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