This is incorrect. EU still buys Russian gas, its just re-routed through friendlier (than Russia) countries like India or Azerbaijan, and it costs a lot more than it used to because of logistics and transit costs.

What is incorrect? EU buys a lot less russian gas than it used to - that is an undeniable fact. And how exactly is russian gas re-routed through India to EU? Have you looked at a map lately? There is nothing in any other country that can match the output that was being piped directly to the EU from Russia. The pipelines to India and Azerbaijan are a tiny fractions of what was going to EU even when running at 100% capacity.

Germany helped build up russia with money and technology which gave putin legitimacy

Because they thought(incorrectly) that we can "tame" russian threat by having a really good economic relationship with them. Turns out, they don't care, Putin will raze his entire country to the ground and kill hundreds of thousands of his men just to say he tried to bring the Soviet Union back.