Why is he talking to other girls if he wants to be with me? Why's he take out his phone & text other girls when we're together? I'm so jealous?

When we are hanging out together he takes out his phone and makes sure to be obvious about the fact that he's texting another girl. He knows I love him, is he trying to make me jealous? Because if that's his goal he has definitely accomplished it!
Why is he talking to other girls if he wants to be with me? Why's he take out his phone & text other girls when we're together? I'm so jealous?
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