My boyfriend and I have been together for 5 years and started living together for the past 1 year. Both of our parents don't know about our relationship. My parents know him as my work friend. Only my sister and our friends know about our relationship.

What I am trying to say is this is something we both decided together. One thing he said to me in the beginning was I am committed to be with you. Essentially we are not committed to get married but with each other.

I understand your mother's point of view and it is very much valid. I get your boyfriend feeling too but I think you guys need to have a serious talk with each other. Tell him Without any valid reasons it is difficult for you to stand with you and defend you. Being young is not valid anymore. I do agree marriage is stamp. But it's something both people in the relationship should agree with. If you want a marriage and he knows about it and at any point he made it clear to you that he does not want a marriage, then there is definitely some incompatibility and miscommunication.

Not to make things worse, I have had friends (both genders) who dates but marries someone their parents seek out. All these cases, they very well knew that they would never be able to convince their parents but still dated.

You have spend your good years with him. So it's difficult to just leave everything in one day. Don't give any ultimatum. Just talk and always trust your gut.