Fwb stays the night every week

So i have this fwb we've been seeing each other for about 2 months but weve been seeing eachother every week pretty much on ALL of my days off.

I get lonely and I'm sure he does too but i dont wanna date him. I'm 22 hes 37, I'm scared we're getting to comfortable. And for some reason it feels wrong to use eachother to avoid being lonely. But I also feel bad on weeks we don't see eachother. He has friends and does stuff, but Idk.