His wife is accusing him of harassing her sister and he said to her: If I touch your sister then our marriage is invalid. Then he touched her again with desire
Question

                My wife and I where having an argument. She was telling me that she does not like the way I talk to her sister and going on about it etc. I told her "you know if I even touch suraya (my wifes sister) nikah breaks". I am certain that i had no intention of any talaq. When I made that statement "you know if I even touch suraya (my wifes sister) nikah breaks" I was like just lying/making up for it to seem that that is the islamic ruling. I just told her that to give her like assurance that I wont do wrong actions with her sister. After some time about couple of months afterwards I touched my wifes sister with lust. Then after some months I may have touched her with lust again. Now I get waswasa that when I made that statement I had intention of talaq. I am 99.9% sure that I had no intention of talaq but this waswasa is making me feel as though I had intention. The only intention I may have had was not to touch my sister in law and only to give my wife assurance that Im not allowed to do wrong with her sister and that I won't do wrong with her sister . I am certain I had NO intention of talaq. Is there any talaq in this situation? If there is talaq how many talaqs take place?
Praise be to Allah.
    Firstly: 

    You should realise 
    that what has happened of you touching your wife’s sister with desire is 
    something that is undoubtedly haraam. It comes under the heading of zina 
    (adultery) of the hand, of which the Messenger of Allah (blessings and peace 
    of Allah be upon him) spoke. Zina is not only zina of the private part; 
    rather there is also zina of the hand, which is haraam touching, and zina of 
    the eye, which is haraam looking, even though it is zina of the private part 
    that incurs the hadd punishment. After this, how can you claim that there is 
    no reason for suspicion and that your wife has no right to be suspicious 
    about you. What you are doing is very suspicious and is indicative of bad 
    intentions and a bad attitude. 

    It says in the 
    hadeeth narrated by Abu Hurayrah from the Prophet (blessings and peace of 
    Allah be upon him) that he said: “Allah has decreed for the son of Adam his 
    share of zina, which he will inevitably get. The zina of the eyes is looking 
    and the zina of the tongue is speaking. The heart wishes and hopes, and the 
    private part confirms that or denies it.”

    Narrated by 
    al-Bukhaari, 5889; Muslim, 2657. 

    According to a 
    version narrated by Muslim: “The zina of the eyes is looking, the zina of 
    the ears is listening, the zina of the tongue is speaking, the zina of the 
    hands is touching, and the zina of the foot is walking. The heart longs and 
    wishes, and the private part confirms that or denies it.” 

    The Messenger of 
    Allah (blessings and peace of Allah be upon him) warned against touching a 
    non-mahram woman and said: “If one of you were to be stabbed in the head 
    with an iron needle, that would be better for him than touching a woman who 
    is not permissible for him.” Narrated by at-Tabaraani from the hadeeth of 
    Ma‘qil ibn Yasaar; classed as saheeh by al-Albaani in Saheeh al-Jaami‘, 
    no. 5045. 

    If this is a sin 
    and crime in the case of any woman, and means that you cannot be trusted, 
    then how about if it involves your wife’s sister, who is haraam to you so 
    long as her sister is your wife? 

    What you must do 
    is ask Allah, may He be exalted, to forgive you for this sin and repent to 
    Him; you must also resolve not to do that again and to block all ways that 
    may lead to fitnah or temptation with this woman. So do not be alone with 
    her, and do not be with her in any place or in any situation that could lead 
    you to go back to what you had been doing. 

    Moreover, there is 
    no need for you to speak to her, with or without desire; if there is any 
    reason for you to speak, her sister – namely your wife – can take care of 
    it. 

    Secondly: 

    With regard to 
    your saying to your wife, “If I touch your sister then our marriage is 
    invalid (‘nikah breaks’),” this is a metaphor for divorce. In the case of 
    metaphors, divorce does not take place unless there was the intention of 
    divorce, as we have explained in fatwa no.
    120947 

    So long as you did 
    not intend divorce thereby – as you say in your question, trusting what you 
    said – then divorce has not taken place. 

    And Allah knows 
    best.