If my boyfriend is talking to other girls but tries to hide it and lies to me about it, should I be worried?

Anonymous
We've been together for two years and two months now and are very close, we both have a lot of opposite sex mates and we don't mind that innocent flirting is sometimes exchanged. But lately talks to other girls all the time, but when I ask him about it, he lies and says he doesn't speak to her. He tries to hide it by pretending he's not that close to her, or avoiding her when he's around me. I'm so confused. Should I be worried that somethings going on, or that he doesn't trust me? Or is it that he doesn't love me like he used to? Or is this some weird thing that most guys do?
If my boyfriend is talking to other girls but tries to hide it and lies to me about it, should I be worried?
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