<human>: From some background(throwaway + names changed) , we met about 5 years ago and dated for almost 3 years. When we were together Andrew and I had a great relationship but about 6 months ago I started to fall out of love and felt we were outgrowing one another. We did try to make it work but I didn't want to give false hope of reconcile when I felt we needed to move on and were leading separate lives. 

Since then we've been pretty much no contact, one or two cordial conversations asking how the other is doing. There was no back slide or drunk messages claiming to miss each other. Over the past 6 months I've been focusing on myself, my career, ambitions, getting fitter and trying to be more social. The last time we spoke was via text when he commented on a holiday photo of mine

So this morning I woke up to a thinly veiled message on a social media site. The gist of this message was that "My life isnt going great, I'm unhappy and miserable since we broke up, I'm in so much pain without you. You're the only one who made me happy" 

Honestly, my heart sank reading the message. I want to reach out but at the same time, I'm not sure if that's best. Would it just lead to worse problems for him or making the moving on process even harder - I definitely do not want to get back together. I'd feel bad completely ignoring him too as I still care about him and want the best. What's the best course of action?

Can you summarize the given text in a few sentences?
<bot>: ex boyfriend publicly laid his heart out and hasn't moved on from our relationship and is still in love. I'm not but am not sure whether to reply.