Separation can be difficult. But remember who you were & still are prior to marriage. Know & acknowledge your worth. Unfortunately, getting involved w/ another married man may have not been a wise choice. This guy may be having the same situation you are experiencing at home, with his wife being in the same position as you are in or maybe not. This married guy has taken advantage of your emotional state during your separation for his own selfish benefit. Once he was satisfied, he most likely, removed himself from the situation & now off to his next victim or back home to his family. You are bigger than this situation. Hopefully your husband will "wake" up before it's too late & maybe he will want to properly reconcile when he realizes the great loss that he may forfeit. Hoping for more than the best for you! Love & respect yourself no matter what! Women are strong, now show your strength. Pamper yourself during this time. Even talk to a counselor about seperation, stress, etc. PLEASE DON'T let this dark road control or define you!
Sorry to hear about . Perhaps if I know more information, maybe I can help. Are you still currently married? Do you intend to rekindle your relationship with your husband, or are you going to proceed with a divorce?
My first bit of advice though, reach out and meet new people. You said you do not have many friends, so perhaps start making some. What are your interests? Do you have hobbies you enjoy? There are meet up groups where I live for people that share things in common. Perhaps that is a good place to start.