Also, this idea that you may have a disorder... maybe you do, maybe you don't. No one here can answer that question for you. HOWEVER... I hope you realise that these types of toxic relationships WILL bring out the worst in you. If someone is constantly ignoring you, disregarding your feelings, and generally being a crappy person, you can't blame yourself for how that makes you feel. No one wants to be treated in contempt by someone they love and care for. Having said that, you are responsible for doing something to stop this kind of toxic dynamic from continuing. If you think you can just learn to ignore it, or be less sensitive, or become less needy or whatever, you're already disrespecting yourself. Do you remember what a healthy relationship looks like? Imagine the type of healthy relationships you want, and compare that to what you have with this person -- are they at all similar?