Why did he reply with a winky face ";)" to me after I sent a heart "<3" is he flirting?

Anonymous
I may be a cringy teenager overreacting because I like this guy so make fun of me all you want but I told him “thank you <3” with “<3” which means a heart and I used it ofc bc. I like him than he sent “anytime ;)” with a winky face? I heard it can be considered as flirting but I can be wrong?
Why did he reply with a winky face ";)" to me after I sent a heart "<3" is he flirting?
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