Couple fight

This morning before work we had a larger argument than normal, to the point I was scared he'd break up with me, I got home from work decided to be nice bring him lunch, it was really awkward I went ahead did my thing & then he grabbed me took me to the bedroom & we had sex then the rest of the day he still acted disappointed with me & awkward around me but, what was the point of sex If you were still mad me? & I feel he's debating about breaking up with me & doesn't love me as much anymore now. Ps no we don't live together he just spent the night at my house last night