Very approximately:
Me: is ranting about capitalism again
M: wait, Owl, are you actually a communist?
Best friend: starts laughing
Other friend: are you serious?
Me: ...why did you think I've been constantly espousing communist ideology for the whole time you've known me?
M: well, I thought you were like, joking about it...
BF: laughing intensifies
OF: M, are you actually serious?
Me: for five years?!

Then she had a huff and went back to playing and I started ranting again (I would often use suicidally aggressive tactics against everyone early in the evening and get knocked out first so I could concentrate on ranting until the next round started (4 stock random characters low items all maps don't @ me)).

Between the autism and being raised by Marxists I've never hidden my radical leftism, so it's not like there weren't signs - me giving detailed breakdowns of the latest news and how capitalism is to blame was a regular thing, and how I converted the other two. I'd dragged them to demonstrations and chatted to the local orgs with them. I know I was so oblivious to her affection I went on a date with her without realising until she tried to kiss me at the end, but I really feel she should have noticed a lot earlier.