Do you think it's wrong to ignore a friend if they ignore you, whether they do it intentionally or not?

I have a friend who I really like to hang out with but he kinda ignores me now which is weird...we use to always talk, chill, and help each other out. But maybe he likes to hang out with his other friends more I guess. I'm not really sure, but it makes me feel left out when he invites someone over his house when I'm right there listening. He used to invite me over. I never really did anything to him so it makes me wonder. I think I'm just gonna act like he does...careless...?