My partner is not ready to commit !!!

I am a 32 year widow, working in a MNC . I have 2 children .After the death of my husband , I became very close to my brother in law , who is younger than me.He used to help me in all aspects ,was great with the kids and so we were kind of always together.One thing led to another and we started having relationship. Its close to 2 years now .Now he has got a chance to study further abroad ,and now says he wants to end all this.He was always talking about us being together and stuff like that but now he is just not ready to broach the topic and have a discussion with me.I told him to atleast commit and so I would wait for him.But he is against all this.

What do I do? I am being pressurised by my parents to re-marry and this situation is driving me mad.

Please advice !!!!!