I want to make my bf's ex jealous!?

you're right, she has no respect for you. but the way to really put her in her place is to completely ignore her. she will feel victorious if she knows that she is getting to you. you should put the effort of making her jealous into looking good for your bf. plus, you don't want him to know that she is getting to you because it shows a little bit of self-consciousness. you have the thing that she wants- that's the most victory you can have over her. she already is jealous of you. just leave it alone.