And his fav. song:
Suhani raat dhaal chuki na jaan? tum kaab awoki
and also
Chu lene do nazuk honton ko kuch aur nahin jaam hai y?
Meri mohaabut paak mohabbut aur jahan ki khaak mohabbut
Mere mehboob tujh? meri mohabbut ki kasaam
Kaun hai jo sapnon mein aya
Khoya khoya chand khula asmaan
Chaudavi ka chand ho
Teri pyari pyari surat ko
Yeh jo chilman hai dushman hai hamari
Jab dil s? dil takra ta hai maat poochi y? kya hojata hai

Romantic,sentimental or brokenhearted songs, RAFI is the best among the best,ustadon ka ustad and as Zohaibkhan said: so many songs but little space

Main kahin kavi nah bun jaoon teray pyar main ay kavita...
Likhay jo khat tujhe...
Aye Gulbadan...
Sau baar janam lain gay... Fav!!!!
Yeh dil tum bin kahin lagta nahi hum kya karain....fav but duet..
Soo many songs but little space...

Main ne Shayad Pehli Bhi Kahin Dekha hai, Barsaat Ki Raat (1960).

Zindagi Nahi BhoolaiGi, same as above.

Also, songs from Ghazal, 1964.

I don't think this song is by rafi but it's romantic nonetheless, so hey :)

"Ae sanam", I would venture to guess it's mukesh. "Ae sanam, jis nai tujhai chaand sa chahra diya hai, usi Malik nai to bhi mujhe muhabbat di hai" or something similar. (movie is deewana)

I liked Rafi's song "Gora Rang Chunariya Kali Motiyon Wali Ke Dil Mera Loot Laya", sung with either lata or asha. It's not a slow number but it's fun. (movie is howrah bridge).

Khoya Khoya Chand is nice too. and Chale Gaye, Hum Bekhudi Main tum to pukare. The first is from kala bazaar, the second from kala pani.

Just watched the movie sangam recently and heard "yeh mera prem patra", really nice :)