It seems fair to say that Tim takes the lion’s share of responsibility in this scenario. Afterall, he was the one who was married and the one who chased you. Like Anne said, you are going through a lot of emotions right now and it is not easy to process them, especially when they are all in your mind. As a suggestion, consider writing an apology letter to Tim’s wife outlining everything you feel and how sorry you are. This will give you a chance to articulate the things that’s been going through your mind and provide an outlet for your emotions. But instead of sending it, just burn it (without causing a fire of course). In Bali, some of the locals do this as a symbolic gesture of recognising an issue but once they processed this and learned the lesson from it, they will make an offering to god and let it go.

Things happen for a reason and everyone make mistakes in life. To grow, we need to take on the lesson (as you have) but it is equally important to not dwell on it once it no longer serve us.