grammar.subjunctive.emotions
Emotion triggers: me alegra que, siento que
Emotional reactions to facts take the subjunctive: me alegra que estés aquí, siento que no puedas venir, me molesta que llegue tarde.
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Explicación
When a main clause expresses an emotional reaction to something, the subordinate clause takes the subjunctive: me alegra que estés aquí, siento que no puedas venir, me molesta que llegue tarde. The fact may well be true — the subjunctive marks it as something reacted to, not asserted.
The trigger family is broad: alegrarse de que, sentir que ('to regret'), me gusta/encanta/molesta/fastidia que, temer que, sorprender que, dar pena/rabia que, and es una lástima/pena que.
When the two clauses share a subject, Spanish collapses to the infinitive instead — adding de where the verb requires it: me alegro de verte (not *me alegro de que yo te vea), siento molestarte.
Ejemplos
I'm glad the business is working.
Región: global
It's a pity you can't stay.
Región: global
I'm glad the business is working, but I fear it's growing too fast.