The first week of testimony in the Diddy trial is in the books ... and Cassie is finally off the stand.

The singer testified Friday for the fourth straight day, starting off with cross-examination from Diddy's defense team ... and lots of texts were read to jurors, including one where Cassie told Diddy she wasn't a "rag doll" after the hotel beating incident. Play video content

Cassie also referenced an affair she had with an NFL player and told his defense she didn't hate Diddy and actually had love for their past.

For the first time, Diddy's defense raised the possibility that he suffers from bipolar disorder ... and they showed warm text exchanges between Diddy and Cassie after she claimed he raped her, with the messages being sent while she was dating her now-

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