hi Catmom2020, id like to join
SandB2015 and say

Is he doing this on purpose? I feel like he wants to grind me down. Sometimes, I feel like going crazy.
likely, the reality is complex.
people with BPD tend to lack in relationship and communication skills. quite often, there is an overwhelming need to be heard, if not to be right. sometimes we feed into that; i certainly did. the key is not to get caught up in it, and pivot with mature responses and ways to manage conflict. it takes a great deal of strength and balance to achieve that.
now if you couple that lack of skills with a very high emotional state, it can feel like a lot of blame and accusations coming your way at once, while youre either trying to dodge it, or maybe trying to say "hey, what about ______".
But my first fear is, that he further brakes me down mentally, if I continue to stay with him.
you certainly dont want this to become the reality of your relationship. the tools here can give you the strength to weather the storms, and the insight to begin to resolve conflict in healthier ways.
Tomorrow, I will leave our shared apartment and travel south-east Asia for 3 months.
have the two of you talked about it? hows he taking it?