Wife seems distant

A little background on me and my wife, we have been married for 7 years. She 31 and I just turned 29. We dated for a year before getting married and we don't have kids yet but we will be trying soon. We both dreamed of having a big family one day. We both meet in college in my junior and it was her senior year and we both have ok careers. The problem is with my wife she acting very strange. She doesn't spend time with me anymore she even gets angry when I ask her if she wants to spend some time together or do anything together. It's like she doesn't want me around. At first I thought maybe it was something I did or said so I asked her and she end blowing it out proportion and screaming at me and bring up things she thinks I did in the past that have never happened and all I'm is trying to figure out what was wrong. I tried being extra nice to her cooking dinner so she wouldn't have to walking her dog, doing all the dishes. None of it is working and I don't know what else to do. I feel she doesn't even care about me anymore there's always something more important she as to do and when we do spend time she is always on her phone. If that's not bad enough our sex life has gone down tremendously we would have sex anywhere from 6-8 times a week and it would always be great but now we barely touch each other. We used to have a great relationship we would do everything together and now it's all going downhill now and I'm just confused and lost. I was hoping someone here may be able to give me so advice. If more information is need to do not hesitate to ask. It's my first time doing something like this so I'm kind of a newbie and sorry if this hard to read I'm not native English speaker.

Put the internet to work for you. via Personal Recipe 2629979