Am I bein paranoid?

So, I discovered a few days ago my rommate was eating my butter (without asking me before, nor simply saying :yo, I used your butter, I didn't have any`. I confronted him, he just said oh ok`` then tried blaming the girl he brought over the night before.

Today, he did his laudry while I was at work and used my fabric softener (after I told him to get his own a week ago since I was the only one paying for it).

I don't want to be the one always counting her food and monitoring everything I own to be sure he isn't stealing my stuff, but I'm starting to feel paranoid and I'm really not ok with his behaviour. What should I do?