Hope your feeling better soon. I ditched work many times in my life , I just had to get a break.... for a long time I worked 3 Jobs. You going off to Target until your Mom was gone to work makes sense.
As for letting this guy know about your self harm , yes that will be tough , but needs to be done of course.
Do you think you might be jumping into bed too soon?? Maybe let it all sink in a bit so that you know he “gets it” to the degree a none MI person can, just a thought . Regardless enjoy his company and I also got a nap into also such a rare Occurrence lol