Los the love of my life help!!!!?

It’s been about 3 weeks since we broke up. Everything has been hard on me I’m doing poorly in school I’ve lost weight since we broke up. I did everything for this girl I was always there for her. We had plans on building a family and getting our life under control and getting married. We dated for 4 years and it’s has been the best and longest relationship for me. This really hurt me I would do anything for her give her everything. She blocked me on everything I didn’t do anything wrong she just broke up over text message. She is lieing and telling everyone I abused her when I didn’t she’s making me seem like a bad person now no one talks to me. She seems like she’s doing really happy by the pics I see her in. She tells my friends she misses me and cries everyday before going to be. But I found out she s already talking to 2 other guys. And that hurts even more. I just don’t understand did she even really love me ? She moved in and moved out with her mom and that’s when things started I changed. Her mom would tell her I’m worthless and will never be anything in life. But I have a good paying job. She talks a lot of behind my back. I just don’t know what to do it’s been hard I’ve been smoking pot and just thinking a lot I texted her Nd she doesn’t reply. When she’s around me she is a way different person but when she’s with her mom she acts a like a b****. I just have some many memories with her I will never forget.