What does it mean that my girlfriend texted me to say goodbye?

Don't think too much and don't be cold to it. Love always does. Whoever breaks up first will regret it more. If this happens to me, I won't rush to reply to the text message, otherwise it will appear that I am too cheap. I'll say it's not bad, and you (if you want to get back together, be vague, if not, just reply.