A Love Story

I have this one breeding pair that I think how thye got together might be a pretty good love story.

I decided to get my one year male budgie a female friend cause his male roommate and him didn't really hit it off. So a week later I got a female budgie that I naned Kitsy, and im assuming shes one year old cause she was kinda grouchy and there were no bars on her head and her cage mate at the time was a male that my mom decided to buy cause my male budgie's roommate would be alone and she named him Jakey, and the pet store owner said that she would still mate with another male. So I brought her home and put her in with my budgie (Tweegy). But after a few minutesi noticed her vent was swollen, now keep in mind i was just begining breeding so i didn't know what that was, so i took her back and the owner calmly said " ohh, yep she's gonna have a baby, i found a egg in her cage today but i thought it was from another female". So I brought her home and the next day she had the egg which i later found out was infertile. So about a month has passed and Tweegy spent countless times trying to mate with her, but she only pecked him and sometimes kicked him. So i decided that maybe if there was another pair they would calm down, so i got another pair. Well that didn't work out like i thought it would, after a while Tweegy started showing the female in the other cage more attention and kitsy was fed up with it and started attacking him. So i put him with the other female, Eve, and i will tell what happened to her mate, or should i say sister in another story, so me and my mom started talking about how Jakey was such a gouch and didn't like humans at all and how scared he got, and how grouchy Kitsy was too, so we decided to put them together and they were so happy, Jakey was no longer scared and grouchy and neither was Kitsy and we figured out that they must have been mates before, and two days ago they mated and they have spent almost all night in their nest box.

So what do u think, do u think they were mates before?