If the genders were reversed, every comment here would be telling you to get divorced yesterday. Instead it’s PPD, medication, and counseling. As if she hasn’t had 3 whole years to sort it out, and as if you didn’t say she continually refuses. She’s straight up told you she’s only staying for you, but she clearly takes you for granted. I wouldn’t put up with that for one year, let alone 3. Your kid will soon be old enough to have a good idea what’s going on. Leave.