Seriously need honest advice

Hi,

I have a FWB(M33), since a year. I asked him if he was serious about me and only sees me, because he takes me on dates (also Valentine dates). He said he was serious about me and not seeing other women. I texted him that we needed to talk..but that convo never took place since Im being ignored

Anyway, I saw him logged in on a dating app a week later. Didn’t say anything about it. But after a few days I texted him that I wanted to talk about something, he asked about what. I explained to him that I had doubts if he was really serious with me and that I would like to talk about that, especially because we have unprotected sex.

Since..I have been being ghosted? My texts are delivered, but he doesn’t answer them since a week. I didn’t really say anything wrong I guess..or shouldn’t I have said that I had doubts about him being serious?

Really don’t know what to do.