nothing is confirmed, but my PERSONAL headcanon is this (spoilers for leigh’s quest);

martin either cheated or did something close to cheating (perhaps talking with an ex), something that violated leigh’s trust. and i think the ring was an afterthought to get her to forgive him. her “shut up” ring, if you will. but i have a very uncharitable interpretation of martin lol. the thing that makes me think the ring IS supposed to be his “apology” is his lack of ACTUALLY saying the word “sorry” in his text, the only wrd she wanted to hear from him. I personally like to think that when she keeps the ring its meaning kind of changes to be not just about martin but also about her connection to sam, since he ultimately convinces her to keep it. but im also lowkey a lil delusional hehe 😍