If a man lies about everything and talks to other females but says he wants me what do I do?

My boyfriend of 3 years has done nothing but cheat on me and he lies to me about everything and he talks to females on line all time but says he canโ€™t live without me and he loves me but has shown no type of nothing to improve himself to me that he wants this relationship unlike I do! What should I do I love him so much
Should I leave him
Stay with him longer to see if he will improve himself to me
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If a man lies about everything and talks to other females but says he wants me what do I do?
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