Ever since Theodore had broken up with Liam, he has not heard anything from him or about him beside they parked out of their old house so moving into a new environment was more like moving on to a new live as well.
Liam had been living his live in pretence of loving Patrick so much. He had himself encouraged on moving on, forgetting all about Theo which deep down he knew it wasn't easy for him But he kept it on and tried loving Patrick. He was together with Patrick for months and came to love him but to find out that Patrick was a cheat broke his heart, it reminded him of Theo who had loved him with everything in him but he only broke his heart and chose Patrick over Theo all because of some stupid crush he had on Patrick.
Patrick had cheated on Liam only one week after they got together and Liam literally caught him but due to the love Liam feels he has for Patrick he had let go of that groge even before he knew it.