Should i leave him and his baby momma dram alone?

We been together 3 years i have a 7 year old son an he has a 4 year old son he also has custody but his sons mom keeps taking him to court for more days and to try to be in his life and cause drama but she is not stabled she is bipolar and was in a crazy home when she was 17 and she tryed to stab him n fights and argue in front of the kid so he thinks its best to just don't speak to her at all n just let her have her 4 days with her son every other weekend. Coming into this relationships I did not know she was this crazy until she started leavening me voice mails on my phone n stalking me just talkin mad **** then I ran in to her when me n him was out she had sum words with her babydaddy I broke it up then she snuck me (pussy ***** that she is) and we got it shaking but I didn't know she was with 5 other girls so she jump me but he was knocking bitches out for me even her his loyalty is to me n she knows that that's y it kills her to see us together she wants wat we have but she's a crazy *** ***** I just don't think I can take anymore of this bullshit what do you guys think? Oh did I mention a year into our relationship he tried to **** her n she ended up telling me in detail but he so call hates her n dosent want to have anything to do with her