It sounds like you had issues with your circle which definitely happens. You’ve gotten some great advice from @BryWisteria about using circles moving forward.
I don’t personally cast circles for spellwork so I can’t personally give experience about moving in and out of a circle without cutting a door. I do have some things that might give you some perspective on your spell and if it worked or not.
What was your relationship like with the person before the spell? – If you and this person had a tendency to argue and fight beforehand, it’s very possible that the spell didn’t backfire it just didn’t work.
What did you use to cast the spell? – Sometimes our associations with different ingredients can affect the energy of our spellwork. Sometimes the energy of the objects we use may not be in line with what we’re casting the spell for. Also, if something wasn’t cleansed (if that was necessary), that can have affects on the spell, too.
What words were said or what energy did you hold for the spell? – I have found it to be very important to be specific with what you want. For example, if you just asked for more attention from this person but didn’t specify why, then you got your attention just not in the way you wanted.
In my opinion, spells backfiring is very rare unless you’re doing specific types of workings and misuse a taglock or something like that. In this case, I think it’s possible that the spell just didn’t work or didn’t work as you intended.