Partner doesnt want relationship due to childhood trauma

My ex and i were together for 5 years but 6mo ago broke off relationship because he doesnt see himself ever being in a relationship again. He doesnt think he can do boyfriend type things consistently doesn’t have hope for relationships at all. His parents divorced when he was 8 so it affected him a lot. He used to say during the break up “it will happen anyway” when it might not have. What do I do? Me and this person are still really close and love eachother but when I asked him if he wpuld be open to it in future he said “probably not. Its literally not you, its me that doesnt want to ever be in a relationship ever again with anyone”. He has a lot of insecurities and self esteem issues and i think that contributes. I’m sticking around because he at I’ll lives with me and we have a lot of fun but inside it hurts to love someone but know they don’t want to be with you :/