my boyfriend is enmeshed with his mom

we have been dating for year and half. very nice human being always helping others and putting others needs for first i noticed they always have plan together every weekend doing the same thing. going to shopping. they live together. he is 27, he mom used to work. but whenever she is off they do stuff together. after work she would and be on the phone complaining about her work . they go gym together and they are lower middle class but he takes him out a lot to eat every night almost. he has to ask her permission for every little thing they share location and keeps checking each other all the time. like crazy she keeps telling infront of me where he is because she checks on him. she commented on love bite i gave him bunch of time. she is nice lady in general. everything they talk end u being in dirty jokes. they sit with each other on couch and watch movie. if they are home they are just sitting home. she is also a hoarder also him . she keeps buying things everyday. more of old antique. he think its all cool and everything about his mom is great. we never had privacy it’s always 3 of us. she has all the energy to do anything with him she is 11pm ice cream road trips and everything. he asked me initial date if its okay for his mom to stay with us after married ? i thought it was crazy. i grew up without mom and family and i always wanted but not anymore. they keep talking to each other all the time and everything. we were about to move for school but the only he school he got accepted was close to his house so it’s another 4-5 years he is in med school he doesn’t wanna take more loan for housing and all.his mom pays for food and everything he wants. i can’t say anything now. she got new job which is remote and she is home all the time. she does her laundry folds and puts in his bed including underwear’s. i feel weird. i recently told him about his enmeshment he admits it but don’t think how serious it is and its affecting me. he doesn’t talk to her as much but still responds her and of course she text everyday he lives me now a days because i don’t work once i start working he will go home. ive roommates andtill not like we live together. soon ill get a job and i know he is gonna go back and her mom gonna drag him to that shithole. he knows her friends he goes with his mom everywhere. i oce told him when you go hangout with your moms friends do they bring they adult kids? and he always some excuse he think he and his mom is special. one time his mom setup a massage with her friend who was practicing and opened a office. he came out of changing room and she woke and and fixed the things he was wrapped around and while he was getting massage his mom also went and massage and his face. it was so nasty. she put that his sons picture of getting massage on facebook and did the advertise for her friends business. it’s all weird to me. everything they talk is like joke and scarcities they think it;s funny which is not. if some guys hits on her she comes and tells him. he thinks his mom is preety he told me and best manager in the country.everytime he sees her he acted like a child. i told him not to go to gym with his mom i don’t feel comfortable since then he was ignoring his mom on that. but everytime i saw her she would mention about going to gym and doing what they have been doing together. its been a topic of fight for year recently he said he is not gonna go at all. he would always say like because im the member ive to be there too scan the card and she can come free with me but this time he said he is gonna tell he can’t if she asked anymore. i’m so drained.