I cheated on my husband and feel terrible :'(

Me and my husband use to argue soooo bad and I thought I was going to leave him so one night I cheated on him. I didn't have intercorse sex... but I did give the guy head and makeout with him.. which is still cheating. Now me and my husband are good. I haven't talked to the guy that I cheated on him with. It happened almost a month ago but I feel so terrible. If I tell my husband he will leave me and we have been so good lately.. I don't know what to do. I been crying so much over this. I cant believe myself. 💔😢