how would op even deserve this?

@14 If she were actually seeing someone on the side.

If a close relative of my girlfriend told me, I would be shocked but I would have a tough time believing my gf unless the person who told me has a history of lying

You would believe your gf's relative more so than your gf?? Wow.

If she did cheat it wouldnt benefit her if she told him so of course she would lie about it. Someone else wouldnt have guilt disclosing this because it wont benefit or hurt them. But really life is all about who u can trust and who u cant and the only person you can trust is yourself

I could understand more if it was one of OP's family members he'd known and befriended for a long time, and that person took him aside and had a long conversation with him including some form of proof. But believing a hospitalized (probably senile) elderly lady, after a 2 minute conversation, over your gf of three years...that is just stupid.

It's not a matter of "who you trust more", it's a matter of "Who has incentive to lie?" In MOST circumstances, there wouldn't be any reason for a relative to lie about such a thing, where as the GF, if she really was cheating, would have a reason to lie about it. Unfortunately though, some people who have no incentive to lie, do so anyway, because they're just sadistic/evil and enjoy destroying other people.

Apparently, for a good reason. He's so gullible he didn't check with her, or anyone else for that matter, to see if the old lady was lying?

Who's he supposed to check with? Most people don't tell the truth if they actually do have another fellow and are asked about it.

two*

Perhaps you should read comments more throughly before attempting to correct them. Your correction is incorrect.

thoroughly*

Too bad the boyfriend won't talk to her.

I think it's a matter of him not suspecting her because she's so old, so not believing she would have any reason to lie. It's a misconception that just because someone is elderly, that they can't be a lying piece of shit. Her Grandmother sounds like she's sadistic and enjoys hurting people for her own amusement.

More likely she has some sort of dementia or memory problem.

That's a pretty far reach you got there.

@26: She is not the first person in these comments to make that suggestion.

I'm not quite sure how this is such a stretch. I've been in enough emotionally abusive relationships to recognize the signs in other relationships and if my granddaughter came to me in one I would absolutely ruin the fuck out of it to save her the heartache I've experienced. Let her be angry with me all she wants if it keeps her from being emotionally damaged by her significant other.

Trying to manipulate the lives of your loved ones can emotionally damage them, too. Even if Grandma disapproves of the boyfriend, she should talk to OP about it rather than trying to take control and sabotage the relationship.