All relationships are two-sided. Whether it is work or dating.
There are some signs when someone isn't that into you
They talk about others in front of you.
They ignore your input.
They make excuses to not see you.
They stand you up on important dates.
They do not return your calls
They strum their guitar while you try to discuss important relationship issues.
If you learn to pick up on signals you will see the signs.
If a guy is treating you like he doesn't give a shit, then he genuinely doesn't give a shit.
If you still need more info on this I suggest you watch.
"He's Just Not That Into You"
@whatsup