Should I text him to ask if he's alright?

Dear All,

I need your advice on a certain problem. I met a guy online about 5 months ago, we were exchanging emails on a daily basis for 2 months then we decided for a personal meeting. He lives far from me, in another city, so we agreed to meet somewhere in a city between our home towns. When we met we almost immediately fell for each other. We fall hard, but our LDR was hard to manage, it was difficult to see each other IRL, we could only have 4 more IRL dates and he became tense and unhappy about it, so we broke up about a month ago. We broke up on good terms, without any hard feelings or drama and as we were very close to each other emotionally, we agreed to stay friends. We kept emailing to each other every day, he told me I am a very important person in his life and he made me feel that way too. We got even closer than we were before, we shared our deepest thoughts and feelings with each other, we supported and inspired each other, there was a lot of love and intimacy between us even as friends. The problem is that he kind of disappeared a few days ago, there’s no news from him. We didn’t agrue or fight, we were as close as always. I have never been nagging or clingy, I always respected his peronal life and his freedom. I have no idea what has happened. Even when we were just friends, no day passed without a message from him, he wrote me a few lines even if he was terribly busy or terribly tired. I’m kind of worried: is he OK, has something happened to him? I’m wondering whether I should text him a few lines after a couple of more days, just to make sure if he’s ok. Do you think it’s a good idea? Or shall I just accept that he disappeared for whatever reason?

Thank you for your attention!

Eve