Anything that causes you to sin cut it off,avoid alcohol by all means since that’s your weakness.Your worries shouldn’t be  your boyfriend’s reaction if you tell him that you cheated but your safety (first)did you guys use protection?you know your boyfriend more when it comes to matters like this how he reacts to them,he left just two days and you cheated seriously some guys wouldn’t believe you were drunk instead you wanted him to travel so you can have time for the other guy.He might be using this against you anytime an argument comes up,seriously if you tell he would never look at you the same way ever,besides he is not yet your husband nor fiance.Trust is very important in every relationship but when its broken it will be difficult to built it up again,work on yourself though if you don’t tell someone somehow might tell but you know the grounds of your relationship better
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Doing your own home face mask or cleanser is the best way to escape beauty products chemical which cause  allergies to the skin since we don’t know how most of the products are made,using fresh aloe vera gel on a clean face for like 15 minutes and wash it off try this until the redness is completely gone or raw organic honey as a face mask this will help solve your problem