LessMissAbs: what I meant is that I should have done something to stop the crush earlier and I did not mean to try get sth out of the crush
In essence, you're talking about nothing. This is all in your head.
That said, I have had numerous irritating middle aged married men throughout my career who I've guessed have had crushes on me. So have my some of my female colleagues. Give them an inch and they will take a yard - I gave one of them my mobile number for work once and he started texting me at 6.00am in the morning - I complained to HR and he is no longer working at the company (unsure if its related). Its not restricted to men - I've heard a couple of male colleagues talking about the older woman at work who has a crush on them and flirts with them, always in quite cringeful terms.
If something had actually happened - if you actually knew this woman well and she reciprocated your attentions, you might be justified in having such strong feelings for her. As it is, you barely know her.
You do realise that another term for "crush" (which IMHO is a ridiculous term for a grown man to use) is "obsession"? The fact that you are going on and on about it on an online site dominated by women indicates that you somehow revel in female attention. Except again, its all in your head. You have not "seduced" anyway (you would probably be too scared to), you do not have a girlfriend, you have not even had a successful date with this woman.
Its a complete fantasy world, all of your own making. I really suggest you take up a sport or get some kind of outside interest, because you are clearly bored out of your skull, and at least that's a healthy and socially acceptable way of curing your boredom. You just like the attention though...
Next you will be regaling us with how your eyes locked across the water cooler, and you knew she felt the same about you as you did about her...