For his part, Trump also felt bittersweet after losing to his friend.
The 36-year-old had inflicted three of the previous six final defeats on Lisowski but fell short at the final hurdle on Sunday.
“It’s tough to play Jack and I’m happy for him. I think it means a lot more to Jack than it would to me,” Trump told BBC Sport NI.
“I’ve been in this situation before and it’s not really going to change anything for me.
“But for him it’s a massive deal and hopefully now this is the catalyst for him to go on in his career.”
When asked if the win in Belfast would be the first of many titles, Lisowksi, with a smile on his face said: “I think so.
“Everyone is telling me it’s going to be so I hope so.”
After a 15-year wait, Lisowski said clinching a deciding frame is the “best and worst way” to win a tournament.
“I want to win all the time and I always believe. But since my dad passed away I feel like it is more serious now.
“Before it was a bit of a game, a bit of fun. Now I feel like I have to win for him.
“I’ve been digging really deep in practice, I’ve been practising really hard to try and get my game in good shape, and it was just good enough.”
