ExpandIt was like chewing BB’s, they were really hard. Do the seeds get any softer if the fruit is more ripe? I like the flavor, but no way I am eating those seeds, I will cook them and use a fine strainer to separate the flesh as fall back.
It's not a problem I've had but I'm certain they're not going to soften. This website may help you deal with them in other ways.
https://www.guavafacts.com/how-to-eat-guava-seeds/