He said that maybe we could get back together after he gets some results from an observation in February...
If the results are bad, he says he will get back with me, as it proves that i'm not the problem.
Seems like a totally lame excuse to keep you on the hook while he experiments elsewhere. On the odd chance that his reasoning is true and he actually believes that it's true, I suggest you stop bothering him and go zero contact. If you keep bothering him about it and he does lousy, then he'll blame it on you for bugging him about the break up and keeping his mind on you.
Don't wait around for him though, do your best to heal from the break up by keeping busy, hanging with friends, doing things you like to do, joining a gym etc. and even casually date other men if you feel you can be a good date and not be pining away for a guy that would break up with you and believe that loving someone is the reason why he does poorly at the job.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion