She is the best girl ever, but i was about to abandon her

First, i didn't know what flare to use so i just picked i thought the most relevant. I can edit the post if necessary.

I found this beautiful girl in a shelter i visited a week ago. I initially went to that place to look for another dog, i was already settled on a Samoyed dog prior to my visit. She was in one of the cages that lined up in the entrance. She immediately caught my attention, clawed the fence to call me. When i got to her cage, she stopped clawing and sit down, almost begging me to take her. My mind was stuck on her but i checked the Samoyed anyway since that was the reason i came there.

Samoyed was... insubordinate to say the least. I'm living in a flat so i wouldn't be able to live with a vocal and destructive dog and that dog checked all the boxes. This girl on the other hand, was the sweetest, most loyal and playful dog i have ever seen. I wanted the staff to release her so i could see how she would behave in a distracting environment. I have 2 cats already so i had to know. She roamed around the fascility with the most heartwarming expression on her face like her dreams just came true. That was the moment I decided she was the one. I signed the papers and took her home with me. She haven't barked yet, adjusted to her new home in record time, never had a poop accident (though she peed on a doormat but it was to be expected) and whenever she sees me, she waggs her tail so hard i sometimes think it will hurt her lol.

But yesterday I had a mental breakdown. I(24M) was with my fiancee(20F). She also has a dog around the same age as my new rescue dog and that dog is even worse than the samoyed i saw in the shelter. Extremely destructive, extremely independent and doesn't listen no matter what. I already have 2 cats, and when we marry, we will have 2 dogs and 2 cats in our home. The more i thought about it the more i got conflicted about my decision of adopting her. Besides, I'm in my 6th year of law school and i have to graduate as soon as possible to afford a life with her, marry her etc. I know these sound like minor issues or at least already big enough that one dog doesn't make them any bigger. But still, at the time i was overwhelmed by these thoughts running through my head and i let my tears run and cried for almost 2-3 hours. At some point, i thought about returning her to the shelter. I felt so ashamed of myself. I took her with me, letting her think this is her new life, that she'll never feel scared and always have a warm bed to crawl in. I started crying my eyes out literally. I was about the put the burden of my half baked decision onto her and let her go, to live in that filthy place again. Fortunately, my fiancee convinced me to not do it and sleep on it.

When i woke up this morning, she came to the edge of my bed, sit down, and wag her tail with the same happy expression on her face when she ran around the shelter that day i adopted her. Not abandoning her is probably my best decision. If i did, i wouldn't forgive myself for that.

Long story short: Never make a half baked decision, especially when it comes to adopting a new pet.