Is this a sign?

So my SO and I have been together for a couple of months and recently we have grown apart. We don't really talk as much as we did or see each other, one of the bigger issues is that I feel like I'm the only one who puts in effort to seeing each other. More recently we fell out cos he's going to a party with new friends and didnt want me to go cus id be distracting...is this a sign that its over? I feel pretty worthless about it and not sure what to do?