advice please

he keeps getting chatous... we been together 4 years... he has a flip phone but just got a tablet couple weeks ago.. the first time I caught him (this is now second) I lost it and he said i was over reacting, his excuse for using the app was he doesn't want to support me finically anymore cause I am struggling to find a job. its not that easy to leave a long term relationship, especially when you have no where to go or no money... already blew my savings on still making sure my half of bills where paid, and I paid for damage depsoit.. he is just paying my half of rent too for this place.. i do want to stay but i am going to get hurt.. i was running a dayhome and it slowed right down so i been actively looking since Feb, and the town I live in is so slow for work, but I am trying. the app is too message people online kinda anonymously i think. we both dont have family out here to stay with either