My (22F) boyfriend (24M) has left me to become a monk

Details changed for obvious reasons (although admittedly not sure if he will even be able to read this)
I met my boyfriend just over a year ago. He's funny, good looking, kind and incredibly intelligent and I love him very much. We have never had any issues. He listens to me, understands my problems and when he doesn't he tries as hard as he can to and we care for eachother deeply.
He has always been a very spiritual type of guy and really interested in history (which was what his bachelors degree was in) and really interested in catholicism and monasticism. I always thought this was just a curiosity, maybe a touch of sentimentalism about his religious upbringing (he was raised catholic). However, a few months in I started to pick up on some things. He would talk often about a dislike of 'the material world', a belief I shared with him to an extent as we are both quite left wing, but also he would sometimes say weird things like "to suffer was noble" and talk about how "honorable" and "fulfilling" he thought a monastic life must be because you are "following in the footsteps of christ" or whatever. Again, I dismissed this as a romanticisation of the field he was studying in his masters (medieval history).
Then, about a month ago, he told he was going to join a monastery and become a Franciscan. This came as a complete shock to me, at first I didnt think he was serious but when it dawned on me that he was I was in bits.
I really dont know how to process this, I've been trying to understand and I tried to talk him out of this but whenever we talked he would calmly quote scripture and this would just make me get upset and angry. I tried explaining how heartbroken I was that he was leaving me like this and he started talking about this welsh priest who used to talk about how evil washing machines were or whatever and how it was important to him to separate himself from material desire in a monastery even if that meant not being with me anymore and that sometimes difficult things are good.
I guess I should be happy for him? I love him so much and I do just want the best for him but that doesnt stop it from hurting. Not really sure what advice I'm looking for just wondering if anyone has ever had a similar experience or knows anyone who has and how they dealt with it???
TL;DR
My boyfriend has had a religious awakening and become a Franciscan friar