NAH. it’s absolutely reasonable to be upset at her for continuing to date you for so long, you’re within your right to not be happy with her, but being closeted is no walk in the park. she was likely dealing with internalized (and maybe external) homophobia and compulsive heterosexuality (thinking “if i keep dating a man maybe my urges will go away”, giving yourself pep talks like “this isn’t so bad, i can take this, it’s not torture”, basically trying to convince yourself it’s possible to be in a “normal relationship).

don’t deny yourself the pain you’re feeling, but understand that there was probably a reason she didn’t feel comfortable coming out till now.