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Classics like Kundera's "The Unbearable Lightness of Being" or Berne's "Games People Play" are the foundation that definitely won't go out of date! From more recent stuff, I'd recommend books where authors break down attachment and its styles - that kind of thing really helps you understand why you behave a certain way in relationships! Start with something specific on whatever topic is bothering you right now - there are tons of books about healthy boundaries, conflicts, or self-esteem, and you should pick based on what you actually need, not just ratings! The main thing is read authors who base their work on research, not just personal experience, otherwise you risk picking up someone else's biases instead of useful information.

I understand you want a universal recommendation, but books on relationship psychology work differently depending on what's actually bothering you! Books about relationship games and classic works are definitely the foundation, but I'd first clarify: are you more interested in unhealthy behavioral patterns, or rather self-discovery and building healthy boundaries?

If we're talking about a genuinely useful modern approach, you should look for not one magic book, but a combination: something from cognitive-behavioral psychology (helps you sort out your thinking), something about attachment and emotional regulation, and definitely something about communication. A lot of people nowadays recommend authors who write about how our childhood affects adult relationships - it's genuinely a mind-blowing insight for most people! But besides reading books, what also helps is consciously applying them to your own life, rather than just consuming the information.

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