At 1400+ grams it is still a big male, males are supposed to be lean they do not look like females.
A fast could last 6 months to a year with an animal that weight.
Here are things you can try to see if he will resume feeding.
Change things around, change the substrate, lower your hot side by 2 to 4 degrees, downsize the enclosure (around 24x16 foot print) etc
You can also take your snake on a car ride secured in a pillow case (30 min to 1 hour)
He may resume the next day after some changes he might take a few weeks, the only thing you can do it try.
Alternate prey items are not a solution at least not until there is a real emergency.
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