Confused.

So I have been feeling very lonely in my relationship and I'm afraid to tell my SO because I don't want to seem like I'm bitching and never satisfied even though I'm not satisfied. We had this talk before about me being lonely and always says he don't know what to say or he says we will spend more time together but we don't. I do love him a lot and want to be with him but lately it's been so different because I kind of want another SO 🙊...I'm so confused and lost. Should I try talking to him again or should I just end it?