If you've been with your partner for 4 years, and you guys have been going through some things but are now taking it slow ... What is the cut off amount month to get things serious agin?

I've been with my boyfriend for about 4 years, and we've been going through so much but have decided to take things slow and learn to date the right way. But I'm afraid he'll get used to taking it "slow" and get used to this semi single life style. We are still doing the same things we've been doing when we were together but giving ourselves more space and individual "me" time. We decided to this Dec of 2014. But I don't know when to give myself a mark bcs I don't want this to be something he gets comfortable with - I want us to get back together eventually.