Is it possible to use a toy too much?

I am a healthy 24 year old female. and am currently in a 2 year relationship that has lost it's "sexual spark" i find my self using my toys more than I used to. I also have noticed that when me and my boyfriend do have sex I seem to be less sensitive to him. Could this be due to my toys. I use them around 2-3 times a week. Where as my boyfrien and I have sex maybe once every 2 weeks... less