"Momoda" is a network language, which is usually used to express affection, liking, happiness or friendliness. If a married man sends you a photo of Momoda, it may be because he thinks your relationship is close or he has a good impression on you, but it doesn't mean that he has disloyal behavior or intention.
However, if you feel that this man's behavior makes you feel uncomfortable or offensive, you can directly tell him how you feel and ask him to stop such behavior. In any case, it is very important to respect the feelings and boundaries of others.