My boyfriend (M18) bit me (F18). Should I excuse the action because of his mental state or take it seriously?

My boyfriend of six months has recently started showing signs of agression towards me. A few weeks back we were fighting and he started yelling and screaming at me for hours after while I sat in silence. When I got up to close the door so no one in the house would hear he yanked me back and punched the wall next to my head with full force. This was the first time he ever got even a little bit physical and i tried to move on from it and eventually did. A few days ago he was very very anxious about every little thing possible. Everything would make him cry or start shaking and freaking out. Me and him were invited to a party that day and came seperatly because I went early to help decorate. The second people started showing up I knew it wasent a good environment for him so I told him that it might not be the best idea to come knowing the headspace he was in. He insisted anyways because he wanted to see me and needed me to comfort him. On the way there he messaged me that he couldn't stop crying and he was panicking. When he finally arrived at the house I went outside to see him and I warned him About how loud it was inside and how many people were at the party many of them strangers. When I said this he freaked out n started yelling n crying so went to hug him and he hugged me back and bit full force into my shoulder making me cry n back off. He still wouldent stop crying and begging for comfort and hugs even after he bit me. He left soon after and a huge bruise is forming on my arm. I feel really hurt by this and he's been apologizing but I can't forget it. Should I excuse his actions because of his mental state?