You've been back together a few months...maybe you don't have to have any 'talk' or make a decision at this time. Relationships go through changes, no one feeling is always certain/sustainable... I would say, relax, enjoy what is good, be honest about your responses/feelings/thoughts in the relationship. Are there specific things that you or he need that the other is not willing to adjust for? (eg: you need time alone...is that OK with him? ...he needs....is that ok with you?)....if negotiation is possible, that is a big Plus.
...