Is snapchat cheating? HELP

I have one friend in my life who I talk to on snapchat. Ive known him 10+ years. We are just friends never even met in person. We talk about food or his work, or my son, etc. He knows I am married and we just chat once or twice a month. My husband called me a hoe and is treating me like shit now. Am I in the wrong? Also hes known about my friend since we met. I thought we were doing good, we are trying for a baby. Now im just hurt.

I've known him longer than my husband. Also he has a girlfriend and we have absolutely no feelings for each other. Not to mention we have never spoken about anything other than friend stuff. He's literally the only friend I have.