This is the 7th most frequent Lithuanian word.
tik
"Only" or "just."
Here, 'tik' is used to mean 'only' or 'just', restricting the quantity.
Turiu tik vieną knygą.
I only have one book.
Here, 'tik' emphasizes the exclusivity of the reason, meaning 'only' in reference to motivation.
Atėjau tik tu dėl tavęs.
I came only because of you.
In this context, 'tik' is used to introduce a conjecture or suspicion.