My husband is cheating on me, what should I do?

If you still seriously love him , then find out if it 's a one-night stand , a repeating habit , or a serious affair.
If it's just an adventure and you like it; try everything, find out, to give him as much as possible, change your look, take care of your appearance, find, in sexual matters, novelties that he likes and that he perhaps does not dare to ask you. Discover his fantasies.

Go see a professional if necessary for advice

And above all, no scene, do not talk about anything. He must want to go home. How many men go elsewhere because they are afraid to return, to suffer reproaches.
Prepare good meals for him. A man's sexuality passes through the stomach.
Now, if you don't love him enough anymore, the question is solved, leave him or kick him out.
If it's an affair, then it's more serious. He attached himself elsewhere. Love may be completely dead.

I confessed my feelings to a woman but every time I try (and it will be almost a year), she tells me to let her think. What should I do ?

She doesn't really want you. A year is a long time. You would have had time to meet someone else. A woman knows what she wants. She is only lost when she is already in a relationship (or when she has a punch in the drawer of course.) We quickly know if it is playable or not. Same for men. They rarely go with anyone out of spite. When they start blowing hot and cold at you, it's because they don't want anything serious.