Question about separation offer.

Just a brief overview. I have been with my wife for the past 30 years. We had 1 kid and she is 28 and no longer living with us. My wife has not worked in 20 years and I always have been working and still am. On single income is not the easiest these days, but we have been managing up to this point.

Earlier last year our doctor recommending my wife go on ozempic to help her with her diabetes. Unfortunately, our insurance will not cover most of it and I do not have the money to pay for out of pocket. This resulted in non stop fights, I suggested she start working again, she suggested I get a second job. We are no longer getting along.

She told me she is going to legal aid to get a lawyer and I thought about it. I assumed "okay" she will send me an offer and ask for 50% of everything, worse case scenario.

No, I am completely wrong on this. I got the offer yesterday, "in order to maintain my clients quality of life.... she requires 75% of my income, wants the house to be sold and for me pay the entire mortgage with my half of the house money. There is more, I just do not want to get into it.

I know I am going to need a lawyer, I just want to look into this and ask around to get an understanding of how this works.

What is the point of sending an offer like this? Is this a normal thing I am unaware of? I hope this is not the new norm or my life is really over.