Just keep in mind there are two very high bars you need to clear to come out ahead on a defamation action:

1. To prove that the factual claims made by the defendant were false, and that the defendant should have known they were false

2. That you suffered actual damages from those claims

Very hard to make happen on a dating app.

Worth pointing out that you're talking purely from a US point of view, and different countries treat slander and libel differently.

For example in the US, to sue for defamation you need to prove something is false, whereas in the UK the defendant has to prove that what they said or wrote (and are being sued for) is true.

(I've no idea whether this app had any non-US use, but thought worth adding this comment regardless since it's a general point about defamation law and being discussed on a site with a big international audience.)