I don't think it is a main relay problem since you can jump start the car and roll start the car. The main relay controls the ecu and fuel pump and those are both working since the car will start when rolled off. If you have a voltmeter you need to first see if you are getting 12v to the smaller wire on the starter when the key is turned to the start position. If not, check fuses, clutch switch, and ignition switch. If yes then check the larger wire on the starter and see if it has 12v and stays at 12v while turning the key to the start position. You can also check the ground from the chassis to the front of the tranny. I have seen starting problems if this ground is bad. Good luck.