Just a cup

[Huromjuicemaker]

MIL lives nearby and sometimes comes over to our flat while we are out (with the excuse of) to drop off some eggs or washing we'd put on her line etc. While she is in she will potter a bit, have a cup of tea and wash anything in the bowl. She is just bored really and we don't mind.
Yesterday we couldn't find DH's favorite mug which I bought him as a gift, hand painted, not cheap china etc. MIL sent DH a message to say she'd accidentally broken it. He sounded annoyed but we agreed its not the end of the world. But I saw his messages later and their conversation went like this:
MIL. btw I broke your mug, i was washing up and it just slipped, sorry
DH. that's ok i didn't like it that much
MIL. worked out ok then!

Now I feel so betrayed, can't even look at him and don't want her in the house

You sound spoilt . Your MIL is going out if her way to help you, she pops in with things for you and to return washing and you call them ‘excuses’ you seem to of had no problem with her running round after you and doing you housework until now. Be careful you will notice when she realises what you think of her and stops helping ,yes you are massively overreacting

Life must be either really hard for you, feeling persecuted like this and taking everything personally, or really charmed in that this is classed as betrayal... I thought you were going to say MIL had cleaned up after the mistress left or something!

He’s either told his mum a little white lie so she doesn’t feel guilty about breaking it, or he’s told you a little white lie that he likes it, so he doesn’t hurt your feelings. Either way, he’s trying not to upset one or both of you. It’s understandable that you’re disappointed that he isn’t as upset over your gift as you’d like him to be, but he hasn’t betrayed you.