Susovan's "I'm learning.." is about the slow, uncomfortable work of getting over people who don't stay. The speaker is trying to accept that some people are only passing through, and that being left doesn't have to be met with bitterness. Each stanza starts with "I am learning," which makes the poem feel like a promise the speaker is still repeating to convince themselves.
The feelings underneath are hurt and guarded hope. The speaker wants to walk alone, take rejection gracefully, and stop offering their heart to people who might toy with it. The third stanza has the sharpest idea: if someone cared, they would have made the effort. By the final stanza, the speaker admits they still haven't figured out how to love, and that love often seems to end in heartbreak. The mood is quiet, tired, and a little resigned, though the trailing "I'm learning.." suggests the lesson isn't finished and the speaker hasn't completely given up.