Is divorce the solution to marital problems that have escalated due to lack of trust and respect, and the intrusion of doubt and unlawful acts, coupled with the fear of committing sins because of constant suspicion?

If you are not certain that your husband has committed unlawful acts, do not accuse him based merely on suspicion, and fear Allah regarding the whispers of Satan. Your persistence in this assumption will lead you into the sin of ill-suspicion and cause you regret. It is not permissible for the husband to insult you, nor is it permissible for you to fabricate problems. Be patient; if the marital relationship deteriorates and you fear neglecting your husband's rights, then seek divorce or khul'.