of course, it couldn't be so easy with these two, but that's only natural. they both have their doubts and fears: mj's reluctant to get married in fear that her marriage will turn out the way her mother's and her sister's did, and she'll end up regretting it and paying for this mistake for the rest of her life, and pete's afraid he'll be an inadequate husband to a wealthier and more successful wife, that mj will eventually get bored with him and frustrated with his lack of ambition.
i still think this is going to work for them in the end.