I'm confused; are they still in the breeding tank or are they in their own separate tanks? If they're in the breeding tank, you shouldn't show him a mirror or another female.
I'd say start over and separate them in the dark. The following day ( if the male is stressed, keep him in the dark for at least 2 days), flare him to anything for a longer time ( 15 min should do - I usually do it for about +/- 1 hr (but I regularly exercise for 15 - 30 min) - Make sure he flares the whole time. If he doesn't, it can be signs of stress or health issues..... occasional rest is normal. Then rest him again. Show him a female the following day and see if he flirts.... I hope this makes sense.