As long as they know their limits, it's ok. But we don't know until when can they stay within the limit. It's true, when a partner can not get what he/she needs in a relationship, they usually they get it from others. Like if your partner is not talking to you, she might be talking to someone else. People don't just do things. They do it for a reason, or sometimes, they are reacting to situations. Remember that for every action, there's an equal reaction.

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Everything happens for a
reason.