You sound so much stronger than even you realise.
Of course it is an open wound, but you are receiving and most importantly hearing the good advice for poster's.
At nearly 60 I have listened to a fair few regrets from great woman, nothing worse than 40 years of regrets.
You have escaped him early enough to have a truly great life ahead of you.
Your brother is so right.
He was never good enough for you, hence why he wanted distance between you and your friends.
Bad men never want family and friends too close, they live in fear of being found out.
They know they are unworthy of who they are with.
You are an awesome woman for leaning into this pain, until you are fully emptied of it.
And you will be, I can guarantee it.
The day is coming where that dark cloud over your head will move slightly to no longer directly above you. Then it will slowly move just that further bit away, it's power over you weakening all the time.
You know in your head that you deserved so much better than him, and your heart WILL catch up and that ache will ease.
If you could seek out an excellent therapist, maybe online, to talk out loud to, it could be very helpful, as is the suggestion of even a little kitten that might not be too tieing down, perhaps your brother could help there for back up?
So delighted you are banking money and planning a wonderful trip.
You are in my prayers.
Stay strong, you HAVE got this.