obsess
/əbˈses अब्ˈसे̮स्/ verb [T, (usually passive)] be obsessed (about/with somebody/something) to completely fill your mind so that you cannot think of anything else किसी बात को दिमाग़ में ऐसे भर लेना कि कुछ और न सूझे, किसी बात से मन का पूर्णतया आविष्ट या ग्रस्त हो जाना
He became obsessed with getting his revenge.