When a friend starts dating someone, they’ll disappear a little. Leave the door open for when they surface.

New relationships absorb an enormous amount of attention for a while. It is not usually a judgement on you; it is that early on, one person can fill all the free hours, and your friend genuinely does not notice the imbalance from inside it. Making that a conflict rarely brings them back faster. Treating it as a phase, with the friendship still available, usually does.

Keep inviting without keeping score. Send the occasional message with no complaint attached, and make the plans you want whether or not they come. When they resurface, and most people do, skip the lecture about where they have been.