Swiper, No Swiping!

I am so far from perfect, it's not even funny. In D&C we've been learning about the Laws of Retaliation and Forgiveness. What a coincidence that we're learning that right when my stuff gets stolen . . . again. Okay, so I've gotten over the last time my stuff got stolen. I mean, I'm a little sad still, since there was a lot of sentimental value to those items, but I don't want to beat the people anymore. However, now that I'm struggling financially and in many other ways, and the person who most likely stole my money knows that, I have a hard time forgiving and not retaliating. I can't even imagine how hard it must have been for the early saints to forgive their persecutors.
What do you do? How would you handle the situation? It's not like I can accuse this person of doing it because I'm not 100% sure and that's an awful thing to accuse someone of. But, if I can't confront this person about it, how do I know I can trust them and trust that my stuff is safe ever again? It's not exactly hard to break into my room after all. What do I do? What should I say?
Help!