The 24-year-old singer ended her relationship with the 'Yeah 3x' hitmaker in February 2009 after he assaulted her but still has fond memories of their time together, which began in late 2007.
She said: ''I'm reminded of a lot of things. A lot of good memories. The slightest things...hotel rooms, tour venues, any little thing, music [and] songs. I do miss him at times.''
The 'We Found Love' hitmaker - who dated baseball star Matt Kemp after splitting from Chris and was most recently romantically linked to rapper Drake - also revealed she is looking for a man who will ''respect'' her and offer her ''fun times''.
In an interview with Oprah Winfrey's OWN show 'Oprah's Next Chapter', she said: ''I want a man that loves me, cherishes me, values me, but they have to know my value in order to value me. They have to know my worth, and they can only know my worth if I know my worth. I want them to respect me, but I want fun times. I want laughs more than anything.''
The full interview airs on August 19.