Should I plant this in the ground?
Pics below : worried that this might get huge and wide and suck all the nutrients out of the ground. If I do plant it, how wide would it get and how close could I expect things to be able to grow reasonably well? It’s in a pot at the moment and has been for 2 years or so. 
Would it be a mistake to plant it 2-3 metres from the house?
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Do you have a name or know which cultivar it is exactly?
Is it supposed to be a slow growing or smaller type of conifer?
If you do not know or cannot find out, I would plant it further away if you don't want to be digging it up in a few years time.
Some dear friends bought a (supposedly) slow growing one that they dug out maybe ten years later when it was snuggling up to the house.
I do like the way the cones are nestled in there.
It does as you say look a slim type. It may well stay narrow relative to the height, but still get too wide in later years.
If you can move the pot and stand it at the 2 and 3 metres point. Stand back and visualize it, even if it does not spread much in circumference.
Take this one as an example?
Although it may not be your exact one. The description. 6m tall (20 feet)
1.5 wide (5 feet). Guessing that is the usual after ten years often quoted.
https://www.thompson-morgan.com/p/thuja-occidentalis-degroots-spire/tka3604TM
I am now looking them up all over the place for something like yours as I like it
Yours has grown two feet taller since you got it, though not much wider. But out of the pot in a few years yours might attain similar.
Sorry for any confusion.
Good Luck, I buy things then often they sit in a pot get moved around and have to be repotted as I can't decide where to put them.