Sometimes talking with a therapist/ counsellor (T) can help you work out the reasons why you stop taking the meds. So maybe that would be a good idea.
You have a good incentive to continue taking them so I would focus on that. It sucks to take meds every day but its better than the alternative (I don't remember how many times I have quit mine... always for the worst)
I might be completely off the mark here but is there any way that you could be sabotaging your relationship by going off the meds. I know there were times I felt like I didn't deserve to be stable, healthy and in a relationship.
I think a big part of it is the illness lies to us and tells us that we don't need to take our meds. You have to fight that all the time.
Some people have suggested to write down why you are taking your meds, and what happens if you don't take them. Then when you are tempted not to take them read what you have written.