Why do men act shy when they are single and get all confident to approach you when they get into a relationship?

LaFemmeFatale_1

When I was a freshman in university, I joined lots of youth organizations, where I met lots of successful young people.

One of them was a Senior student of another faculty, who was a genius, if my classmates needed someone who was the smartest - they always called him,

the most creative? - they called him for help,

the most sociable? - him again.

Plus he was quite sporty and athletic, as I later found out that’s because he was a sportsman too, so he was actually a champion in Eastern Europe at his sport.

He was very popular

It’s no wonder I had a tiny crush on him, even though I never showed.

I never assumed he’d like me, as I was mostly into studies and was a career oriented nerd. So, I just kept my crush as a secret and forgot about it.

He got married before I finished university.

1 year later after finishing university, when I got my things together, became more successful and independent, he got in touch with me and started texting me day and night,

he also told me “he liked me” and he was always a bit too friendly and flirty with me, getting jealous and territorial when I was talking about other men with him.

I saw him as a friend cause he was married.

We grew apart when I started dating my ex and I lost interest in every other men, including that guy from university.

However, it always stayed as a mystery for me, why’d he not be more assertive with me in university if he was attracted to me and why’d he wait till he got married?

I remembered him now, because he messaged me today again, after a long time and tried to strike a conversation. As long as I know he’s still married.

I wonder, why is he interested to start talking to me again?

Updates
5 mo
His wife is so pretty, 6 feet tall model with blond hair and green eyes. I am 160 cm and total opposite of her. Why would he talk to me when he is married to such a cute pretty woman who loves him?
Updates
5 mo
Oh I just remembered my few encounters with him. The last day I saw him I was wearing a very pretty and cute pink summer dress, that was chick and also accentuated my body very well.

I wasn’t wearing a makeup.

That night his best friend approached me and we had a nice conversation, then he joined us, brought me a glass of wine and I didn’t pay him attention. As I never thought he’d be interested in me, because all girls were around him that night.
Why do men act shy when they are single and get all confident to approach you when they get into a relationship?
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