請問如果在繁忙街道不小心碰撞到女士, 佢告我非禮, 警察信佢, 要我保釋, 我可以點樣?

You are mixing issues up.

1. Posting bail does not mean the police trust the "victim". It is simply a standard procedure.

In fact, in many instances, the police will require persons of interest to post bail.

2. You are a suspect for now. The police still needs to acquire legal opinion from the Department of Justice to press charge.

3. Indecent assault is difficult to prove. At the minimum, the police will need additional evidence for the prosecution. A victim's own recollection is not enough.

碰撞到的女士要怒告非禮，應是碰撞動作太不自然了才會被告。
若自問問心無愧，可查看四週有無監視器，再向警方要求調閱監視器還原真相。