Relationship...

I feel like my relationship with my boyfriend is getting weaker... 10 months ago I cheated on him, yes I know it was a horrible thing for him to do and I am so thankful that he took me back and was willing to work on us. But now, things always seem to be going down hill, he never notices to good things I do for him, I always get mad about little things and then get over them it's like I'm bipolar or something. I don't know what to do to let him know that I love him, the only way he seems to show his love is through making love... Any GOOD advice to help me make our relationship stronger, better and more loving?