Block her or?

So my boyfriend cheated on me about 8 months ago (just a kiss) but it was with my 'friend' at the time and was all her fault but anyway not the point. I have her on my Insta, snapchat and Facebook. Should I block her or leave it? I really hate her. I have a spam account for friends only and I post heaps of photos especially with him and she always likes them. Do I block her or leave her and maybe she will be jealous. Help please