He is been cheating

Today I found out that my husband is been cheating on me, idk what to think or what to do. I saw a few messages that he was texting at least 3 girls asking them when he could see them and asking one of them for pictures and after the picture he send all the stupid heart to this lady! I feel so bad right now he never calls me beautiful or sexy like he did with them! I just don’t know what to think anymore