In this exclusive video, Jenna Jameson breaks down as she tells Us Weekly about her violent Apr. 26 fight with beau, Ultimate Fighting Championship Tito Ortiz, that led to his arrest on suspicion of domestic abuse.

She tells Us Weekly their argument erupted when he accused her of being "high" on pills. When she declared "I'm not on drugs!" he didn't believe her and flew into a rage. "I was standing in the bathroom - naked, by the way - and he said, 'It's over!' grabbed my arm and pushed me aside," she recalls (see video, above).

The 36-year-old Jameson -- who has 13-month-old twin boys with Ortiz, 35 -- melts down when asked about their future (Ortiz has retreated to Costa Rica while a police protection order keeps him away from her for a week; she has declined to cooperate with a police investigation).

Unable to control her tears, Jameson tells Us Weekly: "It's just so hard to trust ... anybody in my life."

For more on Jameson - including why she refuses to walk away from Oriz just yet - pick up the new Us Weekly today!