Hmm. Six weeks is just around the time you should be getting over the initial muscle building phase, so my advice could be premature. Just in case, however, I'll try and voice what I think could be the problem. There are two reasons that seem to aptly fit your situation.
Reason #1: Stress
Emotional upsetness unleashes a hormone called cortisol. Its main function is to aleviate stress, but it also suppresses testosterone. Lower testosterone means fewer results from your workout.
There are many steps you can take to avoid this, the simplest is to relax. Before you exercise take a few deep breaths. Protrude your stomach when you inhale (this will help let in the maximum amount of air into your lungs). Then shrug your shoulders as high as you can, hold for a few seconds, and very slowly lower them as you continue to breathe deeply.
Reason #2: (most likely) Undertraining
If you train hard, your body is broken down and weak. But within a few days, your body recovers and is stronger than it was before. It may hold these powers for a few days, but then your strength starts to slip. In this case, you won't notice the the problem from session to session. You will usually only feel that you are not making any progress, much like the problem you described.
How to fix it? Workout either harder or more frequently. A few guidelines:
1. Since you're doing split routines, workout three or four times a week.
2. Increase the weights five to ten percent per week. When you can't do this anymore, you've peaked on the exercises you are doing and need to change them.
3. After six to eight workouts using one system of sets and repetitions, switch to another.
As a side note, make sure you're eating right and supplying your body with the proper building materials it needs, and add a back exercise to your routine. If you'd like any advice on which exercises you should do, or what your diet should consist of, or anything else, feel free to ask.
Take this, and call me in the morning
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