Bruce definitely regrets running away from his problems once he and his team saved the world from the evil robot Ultron that he and Tony made. But after landing in Thor's homeland, he was forced to work along side with Hulk and allied with Thor and Loki to save the people from the Goddness of the Death. Thankfully, they had help from Doctor Strange and also located Odison who was lost in earth wandering around without any of his memories.
Once he came back, he noticed that there is a change in the air and quickly headed towards Stark Tower to seek some answers. He might be lying if he didnt say that he missed Tony the most. He must also find Natasha and tell her that his feelings are nothing more than friendship.