Why is my INFJ boyfriend pulling away?

I'm a 32 and my INFJ boyfriend is 39. We've been together for three years. Recently I've found him on date sites. And talking to others. We decided to work it out but he is showing no effort. He knows I'm very hurt. It just doesn't seem like the behavior of an INFJ. What do you all think?

Why is my INFJ boyfriend pulling away?
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