In my opinion that’s normal from time to time for everyone, not exclusively for addicts. Life changes, habits change, needs change, we as individuals change.
I myself was very reclusive and easily worn out by social interactions for many times in my life. In my case this is a strong sign that I need rest, lots of rest and focus on ME.
Therapy and sharing here on TS help(ed) me a lot to understand myself better and to build a life that suits me and my needs.
You mention that your relationship is not healthy. That’s a huge energy thief, speaking from experience. There also professional help, boundaries, detaching and maybe looking into codependent behaviour can help.
Making friends as an adult takes time. And it starts with feeling comfortable in your own shoes so you can walk along with other people from time to time so to speak.
When face to face interaction is draining, text, send pictures, memes. When you find a nice facebook group, take part as you feel comfortable. When you do a meeting, listen and say a friendly hello and good by, that’s enough. When you have a friendly neighbour, have a short conversation about the weather when you meet on the street.
Conversation is no magic, it’s often just a friendly hello, maybe a how are you doing, a bit listening, a bit sharing about yourself. Nothing big, like “i like the rain, nature needs it” or “my basil is thriving, it’s nice to have fresh basil on tomatoes” or “your cat is lovely when they sleep comfy on the window sill/porch/whereever”.
It’s absolutely ok to keep conversation short, a “nice chat, I have to go, have an appiintment, by” is fine to end it in a nice way. Remember: your laundry is always there for you and nobody knows that you have an appointment with your washer.
To train social interaction in very short sequences, you can wish the cashier at the supermarket a nice day, say an additional thank you to people in your daily life when it fits, give yourself a smile when walking by a mirror or glass front.
Those micro-interactions add up in feeling more comfortable in social interaction. More connection will follow, it’s surprising and it’s worth it. But first you start by talking to yourself kindly, friendly and in an encouraging way 
You are not alone!
If you like, hop on the gratitude thread here, gratitude is a booster for all good in life.