<human>: Can you succinctly summarize the text in 1-3 sentences?

I am just wondering if I can legally kick my ex out of my apartment. 

I am the only one on the lease and he moved in with me early into our relationship after I had been living here for a year or so.

I am trying to kick him out but he doesn't want to leave. He says that since he pays rent and all of his stuff is here that I cannot just kick him out. He is not on the lease and I live in an apartment complex. They have no idea he lives here. 

I am not sure of the laws. Since he has been paying rent, can I not get him to leave? I live in WA state.
<bot>: Ex doesn't want to leave my apartment. He is not on the lease but pays rent. I want him out. Is it legal to just get him removed?