Your abuser may have ways of tracking your activities on your home computer that are difficult to prevent.
If you are concerned about the safety of using your home computer, if possible, use a computer at a public library, a school, an internet café, or at the home of a trusted friend.
Please visit the following government site on Staying Safe Online.
Is there anything I can do to prevent my abuser from seeing what sites I have been on?
The cache and history files on your computer show what sites you have recently visited. You can empty your cache and clear your history files after each time you have used your computer.
But you should very cautious about clearing all your cache and history files. If your abuser is comfortable with computers, and sees that you have cleared all the cache and history files on your computer, they might get angry or suspicious. If that is a possibility, it would be better for you to use a computer they cannot have access to - for example, at a library, a friend's house, or at work.
Another option you have is to delete only specific sites from your cache and history files. If you are comfortable with computers, you may want to do this. Your browser will have instructions about how to delete specific files from you cache and history.