Fight and I don’t know what to say

My boyfriend and I got into a little bit of a fight tonight. He is gone seeing his mom. He’s not coming back till the end of this week and we’ve hardly talked since he’s been gone. Tonight I asked him why he never tells me he misses me and he told me because he doesn’t miss me. I got angry and asked him if I really meant that little to him and if so I can leave. He told me I don’t mean that little. So I asked him then why don’t you miss me. He tells me I don’t know I just don’t. I don’t even know what to say. I’m angry and sad. Any advice on what to say?