Meaning of 又把聚会当做一次分手 Hi I'm trying to figure out what the lyrics of mean of 思 念.

The last sentence is 

又把聚会当做一次分手

However, the grammar is a tad difficult and I'm struggling to make sense of it.

My interpretations:
Again, treat our meeting as goodbye?
As soon as we met again, it's goodbye?

Can someone explain it to me
Your interpretations is quite right.

The lyrics means:

Even though we met again, but soon we separate again.
It should be treated as a goodbye, rather than a meeting.