I want to help him

My boyfriend has really bad anger issues and really low self esteem because he is over weight but I love him so much and I don't know how to help him he is really trying to take control of his issues but he's finding it really hard and he goes through a lot of guilt and I think may be struggling with depression especially after we have a argument he has never hit me or anything but some things he says really hurts and afterwards when he's calmed down he appolagises and will make another session with his counseller because he wants to be a good boyfriend and not hurt me I just wanna know if anyone has advise about what I can do to help