Girls, How to know if a girl think of you as a romantic interest or just a person to talk to?

Anonymous
My English is kinda bad so bear with me a bit here. I met a girl at a park near our home. After our first meeting she breakup with her boyfriend (most likely a coincident and have nothing to do with me). We continue to met each other at that park several time and she is really open up. She talk a lot about her personal life and don't really mind about personal space or skin touching. She also said that she just got out of a relationship and she didn't want to take part in another one for the time being, so i hold myself back. But the strange thing is that despite having a lively conversation in real life, it takes her hours just to reply my message (the 'seen' function can't be trusted). Since she always had her phone near her, i don't think she can 'miss' my message that many time. Some friend of mine said that girl only talk to me because she need someone to talk to. Others said she kinda in to me but try to keep some distance (due to recent broke up). And i don't know which answer is the correct one.
Girls, How to know if a girl think of you as a romantic interest or just a person to talk to?
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