Should I be Concerned?

So, I recently got into a relationship with a guy, and I'm concerned that I'm a rebound. He didn't talk much about his ex, but she moved from the country. One day, I saw on his phone that he liked her status (The new feature on WhatsApp) and wished her a Merry Christmas with a heart. She posted herself on her WhatsApp story, and he liked it. After that, he has been replying to her statuses and made a few Facebook accounts to friend her on as well. We made a video of a song, and he didn't let us stay on his WhatsApp status for long. He deletes everything that he posts about our relationship fast. Why is that? Am I a rebound?

Should I be Concerned?
Post Opinion