Why did he lost interest after getting married?

need solution

my friend and her boyfriend got married after almost 5 years of dating. before marriage he was very much caring. he was very serious about my friend like used to text or call her or meet her every single day. he rushed for the marriage also. may sound like the dream boyfriend. on the other hand my friend was still in a dilemma if he is the right person to get married. but after all his dedication and effort she finally got married to him. but things have started to change. they are living in different cities for educational purpose. her now husband doesn't show that much of affection like before. my friend now has become more caring and loving towards him but he all of a sudden lost interest in her. in most of his messages he seems to be cold and rarely calls her. she talked about it with him but didn't get any logical response. she told me they aren't in physical relation and the reason is him. as much as i think guys approach more than girls for sex but he never even touches her like holding hands or anything let alone have sex. moreover he's very rude said some very mean things to her in recent times when she asked if he has found someone else. all this happened in first year of marriage. the guy she married is like no more exists. it's not like an arranged or forced marriage. he showed interest in marriage firstly. he proposed her for the first date. but now he is an completely unknown person. my friend is kind of helpless in this situation. she wants to save her marriage. both of them are adults her 22 and he is like 25. why is he behaving like this?

Why did he lost interest after getting married?
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