i would like to know what is a healthy grieving process.

Any correlation made by glieck with his way of living is purely his own interpretation of things, and not feynman's. So, you idea that the idea of grief not being repressed doesn't stand up doesn't stand up (yes, read that sentence carefully).

You are not his mind, nor a psychic (no, not psychotherapist) to tell why he did what he did.

If you ever read his "autobiographies" you'll see he's been very well received by women around him (since his princeton years), not after arlene's death.