Leaving my cats with my toxic ex

So 4 years ago my bf (35) and I (25F) brought 3 litter mate kittens in from outside. They were from a feral colony and of course we said we would adopt one or all of them out and it never happened. Me and these cats are fully bonded. Theyre my best friends, children, soulmates. They were with me through my darkest days and I am their safe space.

Im in the process of moving out. I never could afford to live on my own because I was underemployed for my early 20s….i found a studio i can afford and Im worried about having 3 cats in a small 1 bedroom apartment Im renting….

In the past I tried to leave my relationship to stay with friends/family and went back because of my cats. I used to be adamant that where I go the cats go…but life is hard….they like my bf but they LOVE ME. He makes a very good living and has a 3 story house that they grew up in, are comfortable in and have a lot of space in….i know if I left without my cats I might never see them again….but the more I think about it….what I can give them is love and effort…I’d do anything for them….i stayed for them…now that Im facing moving out Im wondering if it would be reckless to take them with me…my bf can give them much more stability than me, he has more financial resources. They would be depressed Im sure…i don’t know.

Any thoughts?