I have un i5 7500 not overclocked and gtx msi 1070 and when i play apex or rainbow or PUBG they are going to like 70 degrees is it bc my cpu is to weak or is there anything else.
70C is safe for both the CPU & GPU and are expected temps while gaming.
Getting a aftermarket cooler would help with the CPU & for the GPU you could always use a program such as MSI Afterburner to create an aggressive fan curve.