This is strictly supposed to be messing around, why do we communicate so much?

I met this girl online and we were talking and getting to know each other. I’m in the nursing field and she always seemed concerned and was asking me about my patients. Concerned about me as well and would ask about my day and things pertaining to my life. We talked for a week until she told me that she was really only interested in messing around but enjoyed talking to me and all. I went dry a little bit because I figured there’s nothing long term coming out of this but she kept the same energy for the most part. She’s studying athletic training and is down here in Miami from Texas at a D1 school. Because of her heavy involvement in football especially she’s mostly watching the games if not at home. She went out and got tipsy with her friends after the first away game and invited me over to her place really early in the morning and kinda confronted me for being dry. We ended up doing the deed and she was really passionate during that and the aftercare, until she made a random sort of excuse I guess and I knew it was time for me to go home after I slept there. She was distant for the first couple of days but went back to her old self primarily communicating on Snapchat sending pictures of her self and us keeping constant communication on there. It has been 2 weeks since we did that but I’ve been busy working and doing school myself and with it being a popular D1 school her program has immense demands and the games are sometimes at home. I understand that she’s keeping her options open and I definitely am too but this is pretty interesting to me out of the situations I am in. If what we did didn’t go well I don't know if she’d still be talking to me and if she wants this to be strictly messing around then why do we communicate so much.
This is strictly supposed to be messing around, why do we communicate so much?
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