I dont really want contact but yeah after i saw she unblocked me i became curious about her motives. Im completely over her though but i cant block her because if i do she will see that i went to her profile on purpose, i never showed a single sign of being affected for the past 2 months
That's not true - FB "suggests" friends to me all the time, based on mutual friends, coworkers, etc. She could easily have "popped up" as a suggestion.
If you really don't want to chance any further contact, go ahead and block her. Your only obligation is to yourself and your emotional well-being.