Do you lend money to people who are close to you?

I lent 100€ to a friend in early January with the promise that i'll have it back a month later because i needed it to go towards my semester fees. I still haven't seen it back. I am kinda pissed because that friend knows i am in a tight spot financially while he currently lives with his brother where he gets food and has a roof over his head for free.
My existence doesn't depend on that money but i just feel like i need it more than him and it is still mine after all.
Have you ever dealt with a situation like that? How should i approach it?
Do you lend money to people who are close to you?
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