The Olympic gymnast and former TOWIE star Lucy split at the start of the year, shortly after celebrating their first anniversary.
Louis, 27, was the one to end things, saying he didn't want Lucy to get "too attached", while Lucy, 24, said she'd like to have worked on fixing things but it wasn't to be.
Speaking in the new issue of Reveal magazine, out now, Louis told us: "Lucy was a great girlfriend, we both loved each other very much and I still love her. It's just that if it's not right, it's not right.
"I still care for Lucy and I want her to be happy. I thought it would be better to part ways earlier on."
But he dismissed the idea they could reunite, saying: "Romantically? No."
Lucy and Louis had dated for just over a year before splitting in February, which came as a shock to fans as they'd just enjoyed a holiday to Thailand, sharing loved up photos to social media.
Results With Lucy owner Lucy later told Fabulous magazine: "What makes it harder is that there wasn't a massive big thing that happened. There was no cheating, no big scandal. We were very happy and everything was going the way it should. It felt like 'it' to me.
"When we got back from Thailand, I just didn't hear from him after we landed. We got back and it was obvious that for him it was done. [...] I'm someone who tries to fix things, but there was no chance to do that. After Thailand, that was it."
Louis has teamed up with CIF for the Before & After Project. Head to cifclean.co.uk/ba
Read more from Louis in the new issue of Reveal magazine, out now