He hasn't replied.

It's been 10 days and he hasn't replied at all or even opened my messages. I'm really worried. His last message was him saying that he has to fix somethings so that we can be happy but I've always thought that a relationship was about teamwork... I don't know. I've been trying to move on, thinking that it's over. However, my heart won't rest till I know he's okay and my gut says to wait but how long will it take? What if I wait for him and it was all for nothing?