What do i do?

Me and my girlfriend have been dating for almost 9 months now and she seems to be thinking that it may end soon.but on the other hand i feel that she is the perfect girl for me and i want her to be with me forever. this whole problem arose when i said i am going to hang out with a bunch of my friends one night, then she brought up that she wanted to be with me that night. So i proposed that she can come and hang out with us. Then just tonight she starts to doubt our relationship and thinks that i don't want her around all the time, but i do. What should i do to show her that i want here around me a lot, cause anything i have done so far she doesn't believe me. Tweet