just need some advice or healing words

I think I just need to vent or just let my feelings out before my anxiety kills me... so I've been with my SO for 5 years and have. 3 year old daughter together he lost his job last year in July and has pretty much had jobs in and off for the past year or so being only at a job at the most 3 months.. barely. I've been the only one working full time since he's been with no job and it's been the most stressful year of my life! He has now been 2 going on 3 months with no job since he got let go from his previous job, he has something lined up but fell through last minute, I really had my hopes up but now I'm back at square one... I had already had my mind set that if he didn't get a job I would call it quits since he basically has not motivation to go out to get a job he waits until I take him out to places or tell him to return an app.. I feel bad to want to call it quits since technically it wasn't his fault about the job falling through but at the same time I'm so tired of being in the same situation over and over again cz he can't keep a job for just not showing up to work or showing up late half the time.. I want to give him a chance but how much is too much and when do you call it quits?