That is his 'stuff' not yours. You are not him, nor are you an extension of him, you can feel pity or compassion for his sadness but you are not responsible for it.

You may have social anxiety issues but I see no evidence of a 'weak' personailty from your posts. Social anxiety gets worse under pressure - it seems you have been put under a lot of pressure recently to 'perform', this is not helpful.

You might want to think about what would be helpful in your next steps, and not put pressure on yourself, consider your options.