
Try offering a designated time and place to hang out. Like “want to grab coffee Saturday afternoon?” Sometimes the time-consuming nature of having to think about your entire schedule and offer up free times to another person delays a response. If they can’t do “coffee” on Saturday, they’ll likely counter with an alternative
It could just genuinely be that things are happening in their life like family/personal issues, school/work things, other possible relationship (friends, etc.) issues, etc etc This happens all the time with ppl I know irl all the time and I’ve been on both sides of this lol, just make sure you’re there for them if they do make plans/want to talk about anything if you want but I would also say don’t be overbearing because that can feel stressful on top of dealing with any possible issues