Is there any other major issues going on between you two or have you both had alot of relationship problems?
What are this "mental issues" he has? Is he taking medication for these issues?
Have you talked to him about this seriously?
Do you initiate sex at all?
It is not unusual for the amount of sex a couple is having to wax and wane.
as nighthawk said how do u know if ther is issues if u are around each other 24/7... and also wanting sex is not a bad thing but it is also not the be all and end all and getting a life is more important...dont actually understand you posting to be honest
One thing that is a little bit strange, you've said you are around each of 24/7. How can that be? Do either of you work or go to school, or are you both retired? Maybe the sex is not your boyfriends first priority, maybe he's worried about other things that are more pressing than sex right now?
It's not bad at all that you want some. but it is a fact that we all have our idea about how much, and that will change drastically with time. You should be compatible sexually, and if you are not, you need to be able to first discuss the issue. Sex is not something that you can force, it's not something that you can use as a bargaining chip, it's either compatible or it's not. Maybe you should look after yourself a little bit more? That's one way of handling it and not letting this get too out of control.