Husband needs help

When I started working out six month's ago I gained weight from not eating enough

you don't say what his diet is like, but being in a like circumstance, 6'2", 240, I feel I can address this. Your husband probably is doing what most do, not eating enough good protein calories. When I started working out six month's ago I gained weight from not eating enough and my body thought I was starving and stored fat. Now with proper caloric intake I'm losing weight at about 2.5-3 lbs a week and adding large amounts of muscle. I would suggest a diet of 2500-3000 calories a day for a man his size.

My husband who is 6'6 had a starting weight of 294. The first two weeks he lost 15 pounds and 11.5 inches. Awesome.
This last weigh in (today) was 2 weeks later. He lost only 3.6 pounds and 3 inches.
We're eating really good. Almost "clean", well pretty well clean. Lots of fruit, veggies, Greek yogurt, Qia seed and a bunch of other healthy clean things.
At the gym he's doing 24m on the treadmill and pushing it really hard. And then he does usually a 30m thing on the bike. Along with arms every other day and he does 100 crunches, and 100 scissors/leg lifts.

He's pretty discouraged right now. He pushes himself so much at the gym, and has been going for 25+ days straight.
He feels like he's doing all this for nothing and I don't know what to tell him. I've tried telling him he's gaining muscle, that the first weigh in was water weight, and that he's still doing great. A loss is a loss
He just says that a guy his size should be dropping fast and this weigh in reslly killed him.

What can/should I say to him? What can/should he be doing??

Could this be related to his hormones? Or thyroid? My friend has the same issue - no matter how little she eats or exercises, she is still the same, and can't drop a pound. She was told she has a thyroid something, but I also think she has too much of a female hormone oestrogen in her. She also mentioned to me that every time she cuts herself, the wound just wouldn't heal for a long time and puss comes out of it. And although I told her to get checked for diabetes, she refused saying "it just can't be".
I understand this is difficult for you to encourage him, but maybe it is worth to go to a doctor to see if the problem lies deeper.
A million virtual hugs to you both! Don't give up!
Kind regards

My husband who is 6'6 had a starting weight of 294. The first two weeks he lost 15 pounds and 11.5 inches. Awesome.
This last weigh in (today) was 2 weeks later. He lost only 3.6 pounds and 3 inches.
We're eating really good. Almost "clean", well pretty well clean. Lots of fruit, veggies, Greek yogurt, Qia seed and a bunch of other healthy clean things.
At the gym he's doing 24m on the treadmill and pushing it really hard. And then he does usually a 30m thing on the bike. Along with arms every other day and he does 100 crunches, and 100 scissors/leg lifts.

He's pretty discouraged right now. He pushes himself so much at the gym, and has been going for 25+ days straight.
He feels like he's doing all this for nothing and I don't know what to tell him. I've tried telling him he's gaining muscle, that the first weigh in was water weight, and that he's still doing great. A loss is a loss
He just says that a guy his size should be dropping fast and this weigh in reslly killed him.

What can/should I say to him? What can/should he be doing??

Could this be related to his hormones? Or thyroid? My friend has the same issue - no matter how little she eats or exercises, she is still the same, and can't drop a pound. She was told she has a thyroid something, but I also think she has too much of a female hormone oestrogen in her. She also mentioned to me that every time she cuts herself, the wound just wouldn't heal for a long time and puss comes out of it. And although I told her to get checked for diabetes, she refused saying "it just can't be".
I understand this is difficult for you to encourage him, but maybe it is worth to go to a doctor to see if the problem lies deeper.
A million virtual hugs to you both! Don't give up!
Kind regards

Big difference between not dropping a pound no matter what you do and dropping 15 pounds in 4 weeks.

Yea, I understand what you mean. But my friend was trying to lose weight since she was a kid, and she is convinced that eating healthy foods is the only way. So, she seemed to be stuck on 200 pounds for ages. I just think he should see a doctor, just to make sure everything's fine. Honestly, I cannot understand how a person may weigh so much, despite a generally healthy lifestyle - it could be a more serious issue.