You were in the strawhats as you have betrayed Luffy as well as the rest of the strawhats for an unknown reason, or even reasons, you ratted them out to the marines, you told them where they were and then they were able to put all of them into prison it has been 2 months since you betrayed them, after you had betrayed them you no longer had a bounty but now the marines had now decided to imprison you despite now no longer having a bounty You are now in the same cell as all of the strawhats