What's really going on?

My boyfriend hasn't messaged me back in 6 months, he even forgot my birthday. What exactly is going on? Is he really busy, did he lose interest, am I over thinking? We have been together for 7 years, the last 4 those years I've been the one putting forth initiative in to messaging and checking to make sure he's ok. Have I done something wrong?
What's really going on?
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