How should I win her back after we’ve had a bad disagreement?
The first step in ““winning someone”” is to let go of our natural habit to make it about ““me””. We all do it and it’s the most normal thing in the world but remember that the other person also wants things to be about ““me””. So, try to think of it not in terms of winning her back but in terms of what she needs. Whilst you also have needs, the best way to reconnect with someone is to understand and meet their needs such that you can then align your needs with theirs. For example, after an argument, most people need an apology but what does she need from you specifically? Is it an apology? Is it an understanding of why you did or said what you did or said? What changes does she need from you moving forwards? And of course, what changes do you need also?
Most importantly, ask yourself why you want her back. Is it simply to fulfill one of your needs or is it to truly partner with her so that you can both become better people together? The more you partner and collaborate such that you integrate your needs together, the more your energies will naturally draw themselves to each other into a stronger relationship.