I Am Suffering From Heart-Break, How Do I Move On?

Good evening dear readers, please I need serious advice from you guys without insult.

I have been dating this girl for close to 4 years now, and am madly in love with her, at first I never love her, she did everything for me to love which i am now, have done everything a man could do for woman, i assisted her in setting up her business, I always ensure she is okay, her family knows me.

We have already started making plans on getting married, before now have been having trust issues with her, whenever her phone is close to me or it rings she is not comfortable, anytime i ask questions she knocks it off.

She will say they are just friends, at a point, I was monitoring her, she knew, friends will call me that they saw my girl with someone.

That same guy usually do call, I have asked her who is the guy, she said they just friends, it was clear she was cheating her attitude towards me change, yet i kept cool for peace to reign and for what i feel for her.

To cut the story short, spoke to her family about it and her brother abroad, now she is angry and she does not want the relationship anymore, I have begged her have also sent people to beg her, she said never that she has moved on.

I am confused i really do love her, the worst part is she blocked me on WhatsApp and messager, and she is not picking my calls, i feel she dislikes me now.

When even I remember my labour in this, I feel so bad with myself, I really don’t know how to move on.

Kindlu pardon my typos, I am not in a rest state of mind

Please Help Me, How Do I Move On?