Need some advice

Precious.
Im fairly new to this app and this is my first time posting, so please be gentle lol
I have been with my SO for 9years and still no proposal, i suffered a misscarriage last year which he never came to the hospital! I suffer with POS and endromesious(spelt wrong) and its been a year since we been trying!
 But i have been thinking about leaving him for along time now, hes aggressive and has been violent in the past, its new years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> and i have no money due to him not working so i pay all the bills and all the household expenses as well as caring for our 7yr old son who i pay childcare fees on top off as he refuses to pick him up from school
Anyway back to the point, its new years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> and its his cousins birthday and due to me having no money, i cant go out this year but he has said its his cousins birthday so hes planning on going out although i only know this because i heard him on the phone, my son has gone to his aunties house so i will be bringing in the new year on my own! And i cant go to my family as i moved out the city to be with my SO 8yrs ago and feeling like ive made the biggest mistake of my life!
Should i be upset that hes still going out? Or am i over reacting?