I've been in a relationship for about 3 years and I think he's cheating, what should I do?

+5Xper
So I've been in a relationship with this guy and our relationship was going really well at first. all my family loved him, my friends thought he was a good guy and all but after 2 years he started to spend less and less time with me, he always went out late and came home at 2 or 3 am. He has these phone calls sometimes and he talks really flirtatiously. He said its just one of his good friends but I'm not really sure. What should I do?
I've been in a relationship for about 3 years and I think he's cheating, what should I do?
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