Hi and thank you for your question.
I understand how hurtful this is to you, especially after 5 months of dating. It's possible that he is seeing someone else now, however even if that is the case he should be forthright in communicating with you about what is going on. Shutting you out due to a fight is destructive to the relationship, and gives you the message that he does not care.
Be very cautious as he still may have some of his womanizing tendencies. Some of the behaviors recently would indicate at the very least that perhaps he is not ready for a true committed relationship.
Yes, I would not contact him at all. Allow him his space and try to stay busy with your own life, friends, activities. Definitely let things settle. If he does show up again, let him know that if he is to continue being with you, that you need him to not disappear when a fight occurs, and that you also would like to know if he is dating someone else. Don't settle for less than you deserve in a good partner!
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