My wife keeps going on trips without me

My wife's family is richer than me and she is used to a more luxurious lifestyle. we are 2 years married and she keeps on going on trips with her cousins or to her parents house in another city. even when she is in town, she will go for kitty parties and social gatherings without ever asking me. so many times, i will come home from work and she will not be there.

we have had so many fights about her taking money from her parents but she just does not listen.

i feel lonely and annoyed all the time. what can i do to make her understand that now that she is married, she needs to settle down her socialising and spending?