I’ve been dealing with much the same. Just got out of a 3 year relationship. I keep wanting to hold her, tell her about my dreams, listen to her yap and call her when I get off from work. When you’re so intertwined with someone it actually breaks a part of both of you to separate. It’s so easy to feel anger or sadness. Feel it. If you have close friends or close family stay with them for a while and just reset. Don’t stay in the space it happened in, it keeps you in that headspace. Stay strong.