Continue relationship with ex's kids, 17 and 18?

So I was in my ex's kids life for 5 years, from 12 and 13 to now, 17 and 18. My ex and I broke up a year ago, I used to be involved in the kids life. Once the ex and I split, I still had the kids over for dinner ever month or so. I really love these kids but life tends to change. Not only is their parent seeing someone new, but so am I although the kids don't know that on my side. I had this tradition of always making them a special dinner of their choice for their birthday. The oldest had a birthday a couple months back and I asked him what he wanted for his birthday dinner. It was planned, I gave up something else important that weekend and the kid forgot about our plans. So we rescheduled... but then the kid never got back to me about coming for sure the second time. It was around that time, he turned 18, big freedom, yay, but also when his parent started dating someone else. It's been over a month since he texted me back about his birthday dinner. I was not sure if I should try again to text him or if he's just newly 18 so hanging with an adult isn't as fun as with friends or if I should just realized, maybe he doesn't want to come anymore. Any advice is appreciated. via /r/Parenting https://ift.tt/3GLSfY6