am i overreacting ?

so - my boyfriend and i have been together for 6 years 22 f and 24 m. boyfriends had a rough relationship with his mom- she has stolen money from him, they’ve gone months without talking, she’s had a rlly shitty boyfriend whose not good to her and has effected their family, stuff like that and she’s the type to never apologize or take accountability. nothings ever been resolved or had a conversation about it’s just “ignored” or pushed to the side. that being said there’s definitely some resentment on my boyfriends end because he’s never gotten an apology for anything but he’s also never tried to get one. any time he brings up something she turns herself into the victim( big narcissistic vibes) so he’s decided it’s better just to let it go.

Also- she is the type of mom where “no one’s good enough for her son”. we’ve never ever argued but there’s been little things - like she dropped off something at MY moms house (we live across town in an apartment) that i wasn’t aware of so i didn’t thank her until two weeks later (that was a problem) mostly little things like that, but nothing big between her and i. well a few months ( december) ago my boyfriend tells his mom he is going to propose to me over the phone(she lives in NC and only comes home on some holidays so it had to be over the phone) , and instead of congratulating him and cheering him on she goes SILENT and changes the subject. like most things, this gets pushed to the side and nothing gets said. we see her over the holidays and act like everything’s fine and dandy because that’s what we do. but then by february communication has gotten a lot less - they send a tiktok here and there, maybe a “hi miss you hope your doing well, happy easter” but nothing in depth. well May rolls around. We are on vacation for our 6 year anniversary. His mother’s bday is may 9, he texts her “happy birthday mom, love you have a great day” and she responds “thank you so much my sweet son. i will love you forever and always. i am so proud of you my handsome boy.” and that’s, that. well two days later he PROPOSES to me 💍🤩. we are on cloud 9 so happy. we make group chats with each family telling everyone, everyone is respond saying how happy they are, crying that they have a new member of the family, saying it’s about time, etc,etc. then we realize.. nothing from his mother. She also didn’t respond to my happy birthday text to her. we give her 24 hours before we get upset “maybe she’s busy let’s give her the benefit of the doubt”… nope, nothing. she views our facebook stories with pictures of our engagement… still nothing. Now like i said - things have been strained in the past, and obviously their communication had slowed but to my bf and is knowledge everything between them was “fine” (what their version of fine is). so for his mother to IGNORE our engagement is insane. We BOTH agreed we’re going completely no contact and cutting her out of our lives. she will be LUCKY to attend our wedding. being upset about something is one thing- but then have a conversation with us. do not ignore the most important day of our lives that comes (usually) ONCE in a life time. is our reaction an OVER reaction?