My question involves alienation of affection law for the State of: Illinois

Last night I recieved a call from a co-workers wife, claiming I was having relations with him. She claimed to have found inappropriate text messages from me on his cell phone. I will admit to these messages, but they were all written in a joking manner, iniated by him. These kinds of messages are an ongoing joke between myself and several co-workers including him. Anyway, his wife called and was threatening to "kick my a**," telling me I "messed with the wrong person" and saying that she was going to come after me and sue me for alienation of affections. In all honesty I have worked with this man for years and there is nothing nor has there ever been anything going on between us.
Also, this co-worker has confided in me about how he is unsatisfied with his marriage. He told me several months ago that he had divorce papers drawn up and was planning on giving them to his wife if the situation did not get better.
I am innocent and have done nothing wrong, its just this woman is accusing me of having an affair with her husband, which is untrue. I am married with a 3 year old, and am unsure how to handle the situation with my husband. He will be very upset with me. I guess my main question is: does this woman have anything on me with the only evidence being 3 or 4 text messages, and can I get in trouble or sued? Any advice?