I don’t feel the weight of time in mc's behavior and his relationship with Felice; they are like people who have just started dating. The author should just say it's been 3 years instead of 30,000 years.
With 30,000 years, the MC should have grown sick of Felice yet also loved her, for such a complicated relationship to foster. By that time, I would have expected them to get close and grow apart countless times.
The MC growing tired of life and attempting suicide just to be resurrected, hating Felice for her selfishness but being dependent on her, and at the end forgiving her and saying he loves her – that's what I would expect from a relationship of such a long, long time. Also mc too naive.