Building support is important and clearly you had expectations that Jay and his friend didn't reach. I think moving on is the only option left. As for not contacting you while sailing in the Caribbean, cell service is pretty spotty in the middle of water and unless the boat had the battery power to power a remote wi fi signal and basically be a floating cell tower, there may not have been a signal to use to call or text you.

From my perspective, you made an assumption that Jay was ignoring your texts with the intention of cruelly trying to hurt you. It's entirely possible that his intention was to figure out what he needed to say and how to say it before saying it. Many people like to think about their words before saying them because they don't want to say the wrong things or do the wrong things. You may be more impulsive than he is, which may mean you two weren't as compatible as you thought. If you want and expect one thing and he wanted and expected something else, things would have likely fizzled at some point.
One thing I know for sure, life has challenges we need to overcome and learn from. I hope this challenge brings you what you need.