Most Helpful Guy
Sounds like if you don't do anything he'll continue talking too this girl so I'd would try and talk too him more about it, and if he keeps saying 'trust me, keep trust me' doesn't sound good
Most Helpful Girl
End it. He's not worth it. He's probably cheating on you with her either physically, mentally or both. He's a douche and no one deserves to be treated like that by the one they love.