How to deal with a jealous roommate/boyfriend problems?

When my roommate and I moved in together, she was in a fairly serious relationship and I was single and actively looking. I hated my job and she was just starting a job she was excited about. Six months later, she is single (and not over her ex/regrets breaking up) and I am in a great relationship that is getting serious). I also have come to enjoy my job and life and she is miserable in hers.

As background, my boyfriend comes over 1 or 2 nights a week and always comes late and leaves fairly early, this is the same amount of time her ex would come over. I am over at his place 1 or 2 nights a week, so we split hosting.

I am sensing that my roommate is jealous of me and my relationship. Initially, when my boyfriend came over, she would sit on the couch next to where we were eating and would watch TV. She would add to our conversation and would come over uninvited to taste the food I made. This was annoying, because I always gave her and her ex space when he was over, but I could deal and my bf and I were always polite wit her.

Over the past week it got worse. First, she is giving me advice that would pretty much guarantee that my boyfriend and I would break up over a non-issue (she told me to engage him in a long talk over a minor issue). Then she decided not to go to a holiday party on the night of my bf's birthday (she knew we were coming back to my place late) and placed all my clean laundry on top of my bed (she was the one who decided to stay in, the laundry was wet when I left, and if I knew she was staying in and doing laundry, I wouldn't have started a load of laundry). Finally, when I get home before her and clean up the place (her dirty dishes). When she gets home, she makes sure to leave all of her dishes out so the place will look messy when he get here.

How would you suggest that I deal with the situation? I like her, she is a great roommate, and it is clear that she is just miserable and jealous and taking it out on me.