<human>: Can you provide a brief rundown of the text in within 3 sentences?

in january, i broke up from a 2 year long relationship (me 24 F, him 23 M). he said all the sweet nothings, how he wanted to stay good friends and how i will always have a special space in my heart. he wanted to be friends. i didnt. 

but then i thought he was a decent guy, we talked it out and i decided that i should try to take the high road, i should try to be friends with him. i knew things werent always perfect between us. but i thought he would be the one who would stick around, work through the hardships.

but things changed. im becoming more and more insecure. i looked at all the social media profiles of his female colleagues. until i found it, the possible evidence of my suspicions. it was all him, his words his interests, his clothes. all pictures of them together were taken from the neck below. nothing concrete that points out that its him. something made me certain it was him. 

since then ive become obsessed. at my best, i couldnt care less. but at my worst, i cant stop thinking abt it. the possibility that he was dishonest towards the end of the relationship stings.

everytime i thought ive reached closure, the negative thoughts came back. i contain myself in a shell of negative thoughts and anger. currently i decided to stay away from him while obsessing on his possible infidelity.

i need to let this go. i know for a fact that i dont need to tie up loose ends with him. i dont want him back. but its the loose ends within me that i need to work on. 

im struggling to position myself in this post break up situation.
i want to know your post break up stories. did any of you go through the same obsession/anger that i am going through? how do i get over it? where should i start?
<bot>: how do you handle a possible infidelity of an ex? how could you stop obsessing about it? how do you find closure?