(((marie))) I am so sorry you experienced this challenge. Unfortunately, often the person that is involved in the cheating is a person's close friend too. It sounds to me like this friend was having some problems in her own marriage and saw you and your husband so happy and began to want what you had "literally" and she began putting moves on your husband. Also, sometimes what happens is how the so called "friend" subconsciously needs to destroy "your" perfect marriage so she can feel better about her own imperfect marriage. Human beings tend to do this where they try to bring down others so they don't feel so bad about whatever they are lacking.

You mentioned that you even "helped" this friend and you were nice to her too. Well, it sounds like she was unhappy and needy and you had the "power" to give. She doesn't have that kind of power. It sounds like she wanted what YOU have/had.

It's no wonder why you struggle with "trust" right now. You have your husband and you love him but he made you "question" how much HE values you and your relationship because he did eventually give in and cheated on you and put your relationship at risk.

He may deeply regret what he did and he may struggle with guilt about it too.

What has he said to you about what he did and how he feels about it?