Is spying on others and thinking badly of them haram?
Short answer
Yes. The Quran tells believers to avoid much suspicion because some suspicion is sinful, and not to spy on one another (49:12). Searching for people's faults and secrets is forbidden.
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is spying on others and thinking badly of them haram?
Yes. The Quran tells believers to avoid much suspicion because some suspicion is sinful, and not to spy on one another (49:12). Searching for people's faults and secrets is forbidden.