Should I stay or should I go now?

I've been wanting to divorce for 2 years and told my wife over a year ago but have stuck it out for my youngest daughter to get older and was going to file last month for her not being there for me during a severe injury and her infidelity but she became deathly ill before I filed and now I feel like I can't leave her in her condition but I'm so mad at how she treated me we were together for 25 years and were best friends until 5 years ago when I was injured then she changed am I a scumbag if I leave her in her condition?
Should I stay or should I go now?
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