Should I cheat on my cheating "partner"? Please help

So basically the past coming on three years I've been with my baby father on and off we have a 9 month old child... He treats me like shit most time.. I was depressed and told him I wanted someone to talk to and he told me to stop chatting shit and later blocked me in every way he does this regularly a couple days before we had had sex for the first time in 6 weeks!! There was no romance no kissing cuddling what I really need right now!! And there hasn't been for ages! I liv on my own with my son and most time he just ignores me, I have no friends and really lonely.. I know my baby father has been seeing and sleeping with other girls his best friend told me but I haven't said anything as I wanna know more. Anyways.. I wanna invite an ex over when my child is asleep just because I know he will kiss and cuddle me something I've been craving for so long! and I'm breastfeeding with no babysitter so I will never meet anyone! With no friends or nothing, what should I do!? Go for it or not