And when you are jealous, is it something that he CAN do to convince you that he did nothing?

I have a boyfriend that is jealous.
Once I bought flowers to myself, and he got angry when he saw the, left my house and did not reoly my texts until the next afternoon.
He thought someone had bought them for me.
I had not saved the receipt.
But actually - he said that even if I had it, that just proved that I wanted to make hin jealous by purpose for the kind of flowers (red ros) was only something that you give in a romantic purpose

There has been severalt times when I Think, how can I prove to him that he can trust me?
Is it anything that I as a partner can to do stop the jealousy?