certainly it is appropriate, just as it is appropriate to make an act of spiritual communion when you are prevented from receiving. it is also one of the best means of asking for and gaining the graces need to remedy whatever situation is separating you from the Eucharist.
Absolutely. Use the time in front of the blessed sacrament to reconcil yourself to God. Also, meet with your priest to discuss what steps you need to take to correct your maital situation.
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