I've read what you have so far, and I have a few thoughts for you!
I'm actually working on a similar project of 100-word drabbles (and I'm very familiar with drabbles in general) so I know a little of how difficult the process can be.
I think your exposition is really well done, and I find that Desmond's moments when he recalls his past relationships are clear. It reminds me a little of the writing from The Hazel Wood, detailed but allowing the reader to fill in the gaps themselves, which I'm fond of.
I do think your flow is a little stilted, at present. The structure of the chapters without dialogue are pretty much all single paragraphs, which can be visually challenging to read. It might be a good practice to have paragraphs that are only a few sentences, so you can break them up with blank lines between to improve the visual. In addition, many of the sentences were around the same length, which made the pacing a little monotone. Try experimenting with emdashes, semicolons, italics, single-word paragraphs, etc to keep the eye dancing across the screen/page.
Flow and pacing aside, I didn't notice any technical issues. While I'm personally never fond of first-person (but I wouldn't say on Tapas it's controversial, as the majority of novels here tend to favor that POV), I do think you're pulled it off very well. I'm already invested in Desmond's journey for love! His friends sound super cool, his exes not so much, and I'm uncertain how I feel about Charles thus far. I'm so nervous that he's falling in love with a guy who just wants someone to keep him warm for a night haha but it's a great premise!
TL;DR break up sentence and paragraph length, experiment with other forms of punctuation, keep your exposition and description as flawless as it already is. Very promising work, here!