Why is it going so well living with my new boyfriend?

His landlord sold his flat so he had to find to a place. I offered he could just stay with me and so far we have been getting on very well with no fights and we both put in 50/50 effort

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I ask this because I lve known people who dated for years then they decide to live together and it falls apart so quickly
Why is it going so well living with my new boyfriend?
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