The spelling of the word "affair the heart" can be a bit tricky for non-native English speakers. This phrase is typically spelled as "affair of the heart" in standard English, and can be pronounced /əˈfɛər əv ðə ˈhɑːrt/ in IPA phonetic transcription. However, the incorrect spelling "affair the heart" may be used colloquially or in informal writing, where grammar rules may be more flexible. It's important to note the distinction in spelling and pronunciation to avoid confusion in communication.