I have two stories to share with you. It involves some friends of mine.
A good friend of mine discerned her vocation. She was accepted to one of orders. After being there for awhile, she knew it wasn’t her vocation. She came out again and dated her boyfriend and later married. They grow old together and very good and holy couple.
I also know another friend whose boyfriend had to break up with her to discern Diocesan priesthood. It was hard for her and it took her sometime to get over it. After 7 years, he will soon become a priest. More beautifully, she is currently discerning her religious vocation as well.
Personally, I am going through the same thing. I am guy and was in a very long relationship. The call to religious life has not escaped my mind in the last 2 years. I finally told my then-girlfriend that I needed to discern and the only to do that is to end the relationship. It does not mean we end our friendship. Furthermore, getting to know her also helps me a lot for who I am today. God has brought her into my life for a reason and now He might have different plans for each one of us - but it is all down to one same goal - to love Him, to serve Him for His Glory, and to praise Him.
For you, I could understand what you are going through. It might be very hurtful and you might even ask why God is doing this to you. Please keep praying, God loves you both and if He truly calls your b/f to offer his whole heart to Him, God will have another great plan for you as well and He will be very pleased about you offer up this relationship for His sake.
If one truly loves someone, one should want the best for that person and pray that s/he will do God’s will. Please hang on to God and keep praying. Going to Eucharistic Adoration will give you more peace and in the future, God also helps you see your own vocation. Be perservarance!
If you haven’t got a Spiritual Director (S.D.), you should talk to your local parish priest, he will find you one - The S.D. will help you with your faith journey as well.
I keep you both in my prayer.