@pinkish_23
I assume sis sobrang napaso na ang husband mo, and he has learned his lesson the excruciating way. I also assume that this happened for the first time, and hopefully the last in your marriage.
Infidelity is a traumatic event. You can only hope for the pain and bad memories to go away, but moving on doesn't happen overnight. What you're experiencing - the flasbacks, unwanted thoughts, hypervigilance, triggers - are normal reactions to trauma. You said you're guarded, it's because your body want to prepare you and protect you from possible things that could hurt you. It's normal in your abnormal situation. It's survival.
Andyan din siguro yung obsession mo to analyze things over and over again, just to make sense of what happened. Sadly, you can't still understand anything.
What I suggest is find a coping strategy that can help you calm your banging emotions and thoughts. For pink_sugar, nagpapakuwento sya ng paulitulit, and it helps her. Others would pray or listen to worship songs.
Another suggetion would be to lay all your rules to your husband, rules that xan make you feel secured. Like telling you all the time where he goes, who he is with, being on time at home, being transparent with his celfone and internet use. He must help you, you're in this together. Nakakasakal sa simula, but what can he do, he was the one who committed this. In time, manunumbalik din sa normal. And you won't be checking him for the rest of your life. Ngayon lang na you're suffering the trauma.
It will help din to understand na, posibleng naging vulnerable ang mariage nyo because of unmet needs, kaya may nakapasok. Try also to make your marriage anew, reinvent your relationship.
Kung hindi naman serial cheater na emotional abuser ang husband mo, matututo na yan. Hindi na yan ulit lalapit pa sa nakakapasomg bagay, assuming he ended the affair with the other woman. Marunong makaramdam ng sakit ang asawa mo, while most serial cheaters don't. Pag nagloko ulit husband mo, walang pakialam sa pain mo, obviously we don't stay with callous people.
So ayun, I hope in time, maging normal ulit kayo, and maging better ang marriage niyo.