He's questioning our engagement 3 weeks out. Should I end things?

My partner and I plan to make our engagement official to family and friends in 3 weeks, basically get engaged. But now he's questioning the entire thing. His family has always disapproved of our relationship, his dad particularly. His dad threatened to disown him if we moved forward w plans, and now he (partner) is scared, confused, has so much anxiety and doesn't know what to do. Because the engagement is around the corner, all the stress and worry has triggered him to lowkey have an episode (he's bipolar). Ever since speaking w his dad and his dad being adamant about cutting him off, he seems like he's hesitant to move forward to save his relationship w his dad.. I just feel lost and sad, I don't know whether to wait for him, or to just end things and move on w my life. We would be 2 years next month. I really thought I had found the one cuz he was everything I ever prayed for.... I just dont know what to do.. This is the worst thing I've ever been thru, and I wouldn't wish it on my worst enemy.