and the rest of the conversation when she brought up the snake's name is like garima is trying to convince her own self that they took the correct decision by saying it to khushi..
and garima says to khushi 'that we question our selves if he is the person i would live my whole life with?'and and that 'this we can only find out by living life' and first time i took this as if after marriage only we can know this for sure,..
but then garima adds another line saying 'and sometimes that relationship becomes the partner of a lifetime!'...meaning was clear! khushi has to live life aka make the decision of whether she'll confess or not/take the 1st steps to start a relationship,(rather than about marrying the snake or not!) which will find her the answer to the question 'is arnav the soulmate she will spend her whole lifetime with?'
and thus what made arnav to act so out of character today in order to present the question/opporunity to answer this question..and what garima is doing is unknowingly answering khushi's dilemma..--> whether to admit or not...