What are the not very clear red flags? They should also be very careful about online dating?

[TheSimFans]

Throughout the night I've been messaging a guy I met on Facebook dating. He texted constantly and let me know if he was at work or at university. Has been textinholiday. Called me but couldn't think on the spot and talk well. I also asked if he had a girlfriend and he said no and did ask. I replied to make sure. I met him on Facebook dating and we have been messaging back and forth, and we arranged to meet at M&S in the City.

[Wise4myage]

Him being desperate could be a bad sign, but if you do meet, take a friend with you.

[TheSimFans]

Being desperate is red flag but also not reply is also red flags if over weeks.