Relationship becoming verbally abusive

Hello,

I've been with my partner for 18 months and have always been aware that he's on the spectrum.  He really struggles and is going through a particularly difficult time.  At this stage he is becoming extremely verbaly abusive to me but he has no support network and I don't feel like I can leave.  My previous partner committed suicide after battling depression (resulting in verbal abuse towards me) and the whole situation is causing me extreme PTSD.  My partner tells me that I don't have any problems and my life is perfect, because I don't striggle with a disability and have a secure job and home.

I really don't know what to do.