Vertical Bull Put Spread Question?

The strike price for the $70 put was, is and always will be $70. Similarly, the strike price for the $65 put will remain at $65 forever. The only time the strike price changes is when the option is adjusted due to a stock split, extraordinary dividend, take-over, or other event that changes the underlying shares after the option contract was opened.

The only significance of $67 at the time you opened the spread is that is the breakeven point (at expiration) for short $70 option if you ignore the long $65 option. However, since you opened a spread that breakeven point is not particularly significant. The significant breakeven point is the breakeven point for the entire spread which is $68 ($70 - $3 + $1). Your net credit when you opened the spread was $2 per share, and if the stock is $68 at expiration it will cost to $2 per share to close the spread.

Your maximum profit is $2 per share if the stock is above $70 at expiration. Your maximum loss is $3 per share if the stock is below $65 per share at expiration. Once the position is open your breakeven point, maximum profit possible and maximum loss possible are all fixed. They do not change due to a change in the stock price. The only way to change them is to adjust your spread through one or more additional trades.

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Huh? When you buy or sell the option the strike is fixed. You have two options with two strikes.