Am I the reason he can’t keep his boner?

My bf (19) of 8months and I were flirtatiously joking about anal, he got hard, I told him go for it, I paused our foreplay to freshen up and get lube, he lost his boner, and we spent the next three hours trying everything to get him ready again with no prevail. We both had assignments to finish, so we called it a night and I cried in the shower probably for another hour lol. I feel like a bad partner and he feels like it’s his fault too.

I love him so much, I’m just afraid he’s maybe not interested or bored with me.