It's so disappointing to read what you had to go through. To start off, what your boyfriend did was outrageously wrong on so many levels! You are in the right here and definitely not overthinking. If your boyfriend was committing to you, he should have been honest with you from the first day. His lack of seriousness is evident by the fact that he didn't think you important enough to introduce you to his friends. That's a red flag right there.
But as they say, let bygones be bygones. I know it's difficult to trust again but you have to move on from the past. whether with the same guy or someone else, it's upto you to decide. In any case, it's important that you open up yourself to love and embrace it fully. If you think your current bf deserves another chance, if you truly believe in him then go for it. Otherwise, it's not the right the choice to give yourself anxiety while being in a toxic relation. Although yes, for now I think you should consult this for your anxiety https://mmjdoctor.com/easy-ways-to-germinate-marijuana-seeds/ Once you are beyond this phase, you simply need to start afresh with a new chapter in your life that doesn't need to have any of the toxicity that the current sort of relation has given you. I hope that you find true love. xo