Keep your 10-22 and the 28-135. Both are good lenses and with just these two you are all set for a lot of future shooting situations.
Set one of the focal length you're considering on the 28-135, tape the zoom ring in place, shoot some shots with that setting and see how you like it. Repeat with the next focal length, etc. This should give you a better feel for your own preferences.
Canon 28/1.8, 28/2.8, Sigma 30/1.4, Canon 35/2, 35/1.4, 50/1.8, 50/1.4, Siggy 50/1.4 and 85/1.4, Canon 85/1.8 are all prime lenses you might consider, at various price points, build qualities and capablities.
On a tight budget, the 50/1.8 is the cheapest.... capable, but nothing fancy.
For tight portraits, wider angle lenses used close to the subject will tend to exaggerate facial features in what can be a rather humorous way... Big noses, etc. Longer tele lenses can be challenging to use in tigher spaces, but give you more working distance from your subject, which might be less intrusive in candid situations.