LG Ultrawide monitor and MBA (mid-2012)

Hi,

My mother bought me an LG ultrawide monitor 29WK500/50s as a gift so I tried to connect it to my MacBook Air 13-inch (mid-2012) through an HDMI cable (because the monitor only has 2 HDMI ports and nothing else).

It works but the screen is stretched so badly and the aspect ratio is terrible.

The monitor claims that it can go up to 2560x1080, but my MacBook Air does not.

I tried every common solution: I tried holding the option key to show more displays, none of them work out.

I tried using SwitchResX and that also did not work out.

I replaced the HDMI cables and they all gave me the same results.

My Mac is updated to High Sierra 10.13.4

Please is there anything else I can try? I absolutely cannot return the gift to my mother and I do not know where she got it from.