How do I know if he's actually interested or if he's just playing mind games?

giftedsub
So I've been talking to a guy for 3 weeks now, he wanted to "be friends for now" but after a few conversations he all of a sudden wants to go on a date with me and he replies to my stories everyday on social media? Is it normal for guys to just flip their emotions like that? I feel like the change of heart was so sudden, we hadn't even met yet. We'll have some conversations here and there but often times he'll leave the conversation off on a high note and I don't understand. I want to give him the benefit of the doubt because I actually am really interested in him but I don't want to get hurt.

I feel like he does show interest by replying everyday to my story and always having something to say but the flip was just so quick and sudden it caught me off guard? What would you recommend I do and what are some signs to watch out for? Is this even something to worry about?
How do I know if he's actually interested or if he's just playing mind games?
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