@Okeydokedeva I am English and I totally agree with your summation of the English! I'm your typical apologetic self-deprecating Brit, but with a big emphasis on openness and honesty, and I found it so hard to meet new mum friends at the beginning; it was all so boring doing the dance of possible friendship, with all these rules of engagement to consider. The polite nods, the mundane chats, when all I really wanted was 'let's grab a coffee and see if there's a vibe'.
I ended up becoming really good friends with two mums, both from mainland Europe, in exactly the same situation you describe. Our children liked each other at nursery, we met at pick up, chatted, arranged a play date, and boom, we had regular meet ups each week - both were so refreshing in their openness (or more often bluntness!) that we're friends for life! I think being an older mother (over 40) played a part, I'm much more open than I was when younger, but I also realised that there's something about my fellow English that exasperates me... just let loose, people!
And while I get the reaction to the word 'crush' I also got where you were coming from. It is possible for two pre schoolers to have a proper connection - my kid and her besties (one a girl, one a boy) are so happy in each others company it's just lovely to see it develop. I also think play dates are a great way to spend time with your children. Boo to the above people who poo poo the idea.
All the people above giving you a hard time sound like the kind of mums that I tried to befriend but couldn't (and I'm sure they'd say the same about me!) but you sound great and don't take everything too much to heart. You might have lost this friendship for your child but keep true to yourself (with minor modifications to accommodate some of the cultural differences) and you'll meet someone who will be your kind of person.