I’m sorry to say this, but I think you should get over him. Mainly because he’s in a relationship with someone else, and you don’t want to ruin that, do you? If you already felt like he was changing after a week, and he also disappeared a few times.. it just doesn’t sound good to me. I understand that you’re in love and it’s so hard to get over someone, but I do think that’ll be the best for you. I’m sorry, I know you’d rather hear something else from me, but this is what I think.