You know that feeling when you've done everything you can, and it still isn't enough? This story hits that note, hard. A fifteen-year-old kid snatches a chick from a cat's mouth, raises it in a city apartment cage, and spends months just sitting next to it because that's the only company he can offer. Then he gets a house, convinces his parents to buy two hens, loses one, then loses the other, and now he's back to square one with a lonely rooster and a family that keeps saying "later." I'm not here to pile on guilt, he already owns that, and he's crying about it. What I am here to say is this: giving that rooster to slaughter is not the only option. It's the option that feels easiest because you're out of ideas, not because it's right.
Let's talk practical. You're fifteen, you live at home, and your parents control the big decisions. That stinks, and I'm sorry. But you've already proven you can work around them, you saved that bird once, and you've kept it alive for over a year with zero experience. That's not nothing. So here's what I'd tell a friend in your shoes: start small. Go online and search for "backyard chicken rescue" plus your city name. There are people who take in roosters, and some will even drive a few hours to pick one up. Post in local farm groups, not just general pet pages. Roosters are harder to rehome than hens, but they're not impossible. You can also call a local vet or animal shelter and ask if they know any sanctuary folks. It takes ten minutes, and you've already cried for two weeks, you can afford ten minutes.
The bigger issue here is your parents' "postponing and shit." That's not a lack of care; it's probably a lack of understanding. They don't see what you see. To them, it's a noisy bird in a cage. To you, it's the living thing you fought a cat to save. So try a different angle. Don't ask for another hen, ask for permission to find the rooster a new home yourself. Show them you've done the research, that you'll handle the transport, that it costs them nothing. Parents respond to plans, not pleas. And if that still fails, then you get creative. Some people keep roosters happily solo if they're given enough free-range time and attention. Could you build a simple chicken tractor, a portable pen, so he can graze safely while your mom's home? YouTube has a hundred tutorials using scrap wood and wire. The point is, slaughter is a permanent solution to a temporary problem. You've got a heart and a phone and a stubborn streak that saved a chick from a cat. Use that.