Me (25F) concerned about my husbands (24M) finances - married for 1 year

There is so much going on with regards to my husband, his family, and our finances.

My dad is contributing half of the rent to the apartment we stay in because my husband can't fully afford it by himself. he recently told me something very concerning. he gets paid very well but he still submits claims to his work over lies. He takes me out for meals and he submits them to his work to claim back for them under the disguise of meeting with a healthcare professional. I do work in healthcare but those are personal meals.

he also claims for office space and submits our rental even thought he is paying half, and the room he uses as an office is not solely an office as we use it for storage too but he submits all these to his work. I don't know if these would count as red flags.

He also continuously borrows money from me to purchase things for our home that we don't necessarily need but he says its just so we live "more comfortably" and he gets upset when I ask him to repay me like he promised. he said that as a wife I should just give the money to him as its benefiting both of us.

Another thing that really annoyed me was that he wanted a PS5 in the beginning of our marriage and he would go to ask his parents to lend him money for it and to pay them back slowly after months. But he would never do the same for me if I wanted something expensive. I just feel like he has the privilege of getting whatever he wants through his parents and I have to wait for months if not years until he can get me anything expensive. Im just looking for outside advice (side note: I bought him the ps5 as a gift and his parents told him no solely because they knew I had already bought it for him and now its going to be a surprise). Can I please have some very honest advice?