Oh OP my first impression is you come across as very likeable but I think you need to do some damage limitation!
Have you told your DP about the note?
Also, even if you do believe these are the right words to describe how you feel, you've given him an awful lot of power here, so maybe best to say to crush that: a) you don't have feelings for him, it was a poor choice of words, it's more of a silly work crush, and b) it is not 'really frustrating and embarrassing', it's just distracting and uncomfortable for now.
Think you could also consciously give yourself permission not to feel embarrassed for having a crush - nothing embarrassing about it. Compartmentalisation is your friend here.
It does kind of read like you're inviting more attention from him though...and in any case, think about it, if a crush tells you about their bad points, you more often than not see it as sweetly self-deprecating rather than actually taking in what they're saying as truth, and similarly if he's funny about it you'll just come away thinking 'ah he's so funny' rather than remembering the very minor faults he's mentioned (because I'm sure he's loving the attention since he's teasing you instead of going a bit awkward and overly civil, and won't actually want to put you off).
I also would never give a man free reign to embarrass me. It's not so much an ego thing as more that the M/F power differential is already skewed. You don't need anyone at work seeing you being put down by anyone, however they're ranked in relation to you, as these form impressions which stick. You're entirely capable of moving on from this without forcing some sort of resentment towards him via being humiliated or cowed - all you're doing there is replacing one inconvenience with another.
I think you can clear it up by talking openly and honestly with both.
Best to be precise re: what you want crush to do. You've basically given him responsibility for tackling your feelings by asking he artificially create some bad atmosphere between you (which by the way makes it a sort of cosy 'project' or game between both of you, not what's going to create distance). It's also quite vague and covers a range of behaviours, which opens space for bonding between you as the submissive party and him as the one who controls the situation.
There does seem to be one particular thing he can do - stop drawing attention to the crush by teasing you. I'd say: scrap what I said in the note - I have been feeling some attraction to you, but would like it to stop. This would happen quicker if you stopped teasing me and otherwise didn't refer to it. I'll also maintain a professional attitude when we're working together.
Do you think that could work and could wipe the slate? Chin up OP, put the lid on the embarrassment because it serves no use, be confident and relaxed on Monday, and just identify exactly, with no vagueness, what either of you can do to ensure a a good working relationship going forward.