I'm glad your sister is finally voicing her opinions and putting her foot down. He won't marry her. If a person shares common life goals and values, they will ultimately be a better choice. Foot rubs and sweet words will never hold a candle to publicly committing and expressing your love to each other, and protecting eachother (legal wise), and exchanging vows.

There is nothing with putting a timeline on things. He said summer, and did not come through. Why even bother with someone who can't commit to you? And if he runs because of her request even after he said he would, then he probably didn't love her that much to begin with. It's just hard to think of life without someone after being with them for 7 years.