Our expert says:
If you feel depressed, you're depressed. Whether or not you have Depression / Major Depressive Disorder, needs more inquiry and assessment, at least by a GP or preferably a shrink. There are a number of symptoms ( described elsewhere within H24 ) not always obvious ones. You could be sad because you have good reason to suspect your gf i cheating on you ; or you could think she is, because you are sad and depressed.
From what you say, and the extent of consistent change from what you usually are, this does indeed sound like a Depression which deserves proper attention and treatment --- so see a doc / shrink for assessment and to discuss treatment options, which should include CBT counselling and antidepressants. You can surely become your old self again, and before very long
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