how My (M35) wife (F29) become a chuck queen (cuckold)

My wife is a doctor she recently started working at a call center pharmaceuticals as a customer care representative as she was comfortable working long hours in a hospital. My wife’s body type is chubby and she usually dresses modestly to hide her curves and body also we come from a sub-continent region where women are usually shy and wear western or modern clothing, However, after joining her new office she started wearing clothes not so modest which I noted and asked her about she told me that environment at her new office is liberal and wearing modest clothing make her outcast there. She started working late hours after one month of joining she told me that due to work pressure she need to work overtime to make things work.

Our sex life is also not that great either. we usually have sex once a week without any passion just as duty sex. Our marriage has become a compromise with each other finding pleasure in small things but usually, we feel depressed and frustrated with each other. We try to keep our marriage intact with occasional movie night sex and dinners