柠檬久伴会心酸
[níng méng jiŭ bàn huì xīn suān]
This means something like 'being accompanied by lemons would make people feel sour'. Sourness of lemons here may metaphorically indicate the subtle heartache or sadness caused by close companionship over time. There could have a complicated emotional story between the blogger and their friend, or even the pain of love behind it.