Short answer in my opinion is yes, I agree with many of the posts that there is no limit to how many you can have affection and a connection with. I hesitate to use the word "love" simply because it can mean different things to different people. You can love a good friend and there be no sexual connection yet you may feel they are as part of your life as any spouse.
You have an opportunity and a tough path to follow in figuring out what your feelings mean to you and your loves. You may want to keep that connection to both but they may not agree or you may not feel like that is what you want and that you need to decide on one or the other in either case. There's no right or wrong answer here, just what you can make work and what everyone in this situation wants.
Your not a bad guy and did nothing wrong that I can see. No lying or cheating, you fell in love and thats great! But falling back in love with your ex isn't wrong either although it does understandably complicate things with both your new love and your ex. Just be honest with them and yourself and do your best.
It sounds as if all of you are interested in a traditional monogamous relationship, in that situation you will have to choose who to stay with as a partner. But there are other possible configurations that can work, with time and effort. Lots of people live happy and non monogomas lives with 2, 3 or more people they are intimate with and even share their lives. It's up to you to figure out what you want and make the best decision you can based on that.
Good luck and I'm sorry you find yourself in this difficult situation, I don't think anyone should have to choose who to love and force themselves to throw away any happiness because they are told its just how its supposed to be. What has worked for me may not work for you or be desirable but I urge you to at least give it some thought and maybe read some on polyamory and see if that could work for you and yours.