Time...Healer???

I have seen so many of them. They get into a relationship so that they can move on in life. Forget about their past and hope nothing like this will ever happen again. Moving on is a must....but should we use someone else to move on in our life? How truthful can something be if it is not spontaneous, if it requires an effort? Moving on is necessary, but does'nt the past try to cling on to you more, the more effort you take to get rid of it? So is it not better to just take life as it comes, using no extra effort to come out of a situation, but rather let time be the best healer?