Dating is tough. It's hard to find someone you click with, but it is even harder when you have an illness. A mental illness. And online dating?.
That acts as a spur to disclosure; it requires negotiation and plan-changing with a date, and therefore your mental health needs to be on the table. Some people may worry that this makes their condition seem less believable to their date, but a person who doesn't believe you when you say you're diagnosed with a mental illness is not somebody you should be spending movie nights with. When You Reach A "Serious" Stage As far as advice on disclosure goes, this is one of the most common tips: that you definitely need to disclose if things are becoming "serious," though how that's defined is up to you sleeping together, seeing each other multiple times a week, calling each other "partner" or "girlfriend," whatever.
When It Feels Safe The notions of "comfortable" and "safe" are discussed a lot when it comes to mental illness disclosure in intimate relationships; that's what lies behind the three-month mark idea, but it could also be more subtle than a timeline allows.