Stealing bf

My bf who I've been living with for a year and wants to marry me stole $20 of mine... WTF???? I love him so much, just over the weekend I bought him two pairs of shoes, bought him food, took him to a movie, gave him $20 for gas, and not to mention put $500 towards rent... He didnt spend a penny because he said he had no money until he gets his check, except when he needed cigarettes he magically had $10. And now today I saw that $20 that I was saving was gone. What the hell is he thinking? How can someone be so unnapreciative? My heart has been hurt like this before, my last boyfriend use to steal my money all the time... So honestly my heart is so numb...