How to tell my partner that his mom is causing me anxiety?

‼️Long post ahead‼️ I just really want to vent out my feelings bc I have no one to share it to. Ayoko i-publicize sa friends at families ko ang problem ko so here I am. Actually, I have already told my partner last year, days after our baby's Christening that his mom is already causing me anxiety and I want to stop overthinking na by breaking up with him. I want to cut ties na with his mom. I don't want any connections na sa mom nya. I wrote a message to him, telling him my reasons. Here are just some of it: When we invited them to our house for our gender reveal, first time nya ko makita ulit bc of lockdown and house quarantines, I was 5 months pregnant, I know that I lose all my beauty, I gained a lot of weight, I look ugly, pero that is not enough para salubungin ako ng, "Anong nangyare sayo? Ang dami mo ng tigyawat." Sinabe nya yon habang nagbebless ako😥 Nakaupo ako sa hagdan, nilapitan nya ko, I was wearing a dress, and she said, "Ang dami mong peklat! Nung ako nagbuntis kay *** hindi man ganyan." Pag naaalala ko, naiiyak talaga ko. I was carrying her first grandchild, at wala syang ginawa kundi laitin lang ako😭 8 months na simula nung sinabi ko to sa partner ko. Ayaw nya makipagbreak kase syempre may anak na kami, wala din syang tatay kaya ayaw nya paranas sa anak namin, at feeling nya daw hindi na sya belong sa family nila. Naging okay kami ulit at nilinaw ko sakanya na ayoko sa family niya. I have many reasons why pero I will just keep it to us na lang. Now, bumabalik na naman anxiety ko. Siguro dahil parang nakalimutan na ng partner ko ang issue ko sa family nya. Akala nya siguro okay na ko sakanila. Gustong gusto ko na ng peace of mind. Pero pano? Alam ko pag sinabi ko to sa partner ko, masasaktan na naman sya. Ayoko isipin nya na kailangan nya mamili kase kayang kaya ko naman sya palayain. Mahal ko sya pero anong magagawa ng pagmamahal pag yung taong yun ang nagiging tulay ng anxiety ko? Natatakot ako na lumala tong anxiety ko, at maapektuhan na ako physically. Baka pati baby ko maapektuhan because of it.😥 What to do mommies?