Relationships=loss of friendships?

Relationships can be good or bad, depending on how you look at it. They're good because whoever is in the relationship happy and in love and having the best time, which is good. I love when my friends are genuinely happy, because it makes me happy. Who wouldn't want to see their friends happy? But on the other hand it can also kinda suck for those who are on the outside looking in. I've probably been guilty of this myself, but a lot of times, relationships make people forget about their friends. Most times it's unintentional, but their time is consumed by this person and everyone else is kind of kicked to the curb. Maybe it's just because you're so used to talking to someone so much and then once they get into a relationship it seems like they don't really remember you anymore. Who knows? I know that's not always the case but sometimes that's how it feels. It feels like the years spent as friends and times you've been there for each other have been thrown away now that this relationship is in tact. Then, when something goes wrong they come looking for you and you're like "oh...uh..hi" because you haven't spoken in a while. Maybe it's just me.