The word 'trust' is rather broad. What EXACTLY is the form of trust do you expect from her? You want her to tell you everything, KGB interrogation methodology, since her birth? We, being mortals & flawed, each have skeletons to hide, that if revealed, will only cause more harm & hurt than resolve issues.
Ultimately, what each Human seeks is to love & be loved in return. By your account - she loves & chose you, & had proven to you. The past is gone, & today is a fresh new start towards a meaningful relationship, to communicate always, to understand each other more, compromise where possible & help each other, to build & strengthen the relationship for a better future.
No being promised that life will be a bed of roses daily. The future often looks daunting, with stories of economic & social failures littered on every pavement. But is hiding from relationships, hoping that with no relations, then no mistakes will be made, a solution? No. It will only hinder your development in the journey of life, which is to progress.
To make no mistakes is the greatest mistake a Human can ever make, because we mortals are flawed, & can only progress by making mistakes & correcting them. If a mortal does not make mistakes, he will only think himself perfect & will always be correct, & when mistakes eventually come, either he can't handle it, or will had only harm many others whom believed him for being perfect while flawed all along..
Have courage. No mortal can predict the future or yours. It's a blank page today awaiting you & only you alone can write it. Do not let your fears hinder you in life. If it is financial situation that worries you - there are solutions-work harder & smarter honestly & legitimately. Singapore is a land of opportunities & even societal funded upgrading programs awaits.
If it is your self confidence, your romance abilities that worries another will take your place in her heart, then find out more about her - her likes, dislikes , etc, then improve yourself in those critical areas, & none can replace you. A girl's heart is not made of stone, more so if she had proven to you that she is not driven by money alone.
If you worry that you are being made used of by her, then think - she too may thinking the same of you using her. The term 'Made used of' is also similar with 'helping out others'. It's only a matter of relative perceptions & perspectives, common when a life's journey is shared.