I think that you should have a ritual to try and mental end the relationship. If this has been affecting you for 5 years then you really need to try something different.

There is no guarantee that 'A relationship funeral' will work, but I think you should try it. As other people have mentioned you only see your therapist one ever 2 weeks for an hour maybe, two, so you need to have other coping methods during that time. The other suggestion of no contact is also good advice.

You need to start having positive mental routines, one good way is meditation. As this will help you clear you mind and focus on present.