Is it worse when someone leaves you on seen or straight out ignores your messages and doesn't want to even open them while actively texting other people?

What should i do about the second case?

If they are treating you that way then do you really need them in your life? This could turn into a lot of drama fast.

Via text I'd tell them, "I at least let somebody know I'm not interested. But seeing as my ancestors were gentlemen whilst yours were still hanging bu their tails from trees, I'd expect nothing more than infantile goo-goo from your sorry brain..." Y'know, something really edifying...

I was the kind of person that was not getting replies and was quite lonely etc. Currently I have a gf, we are together >3 years and live together. I would love to go back in time and say to myself : "move on, there is nothing wrong with you, there are much better, more deserving people out there for you". Hope it helps.