Scientists are still confused between either every thing will collapse or every thing will keep on moving away from each other....but dont worry it will take trillions of years.
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there could be these also ;Big Freeze or heat death, Big Rip , Big Crunch 3.4 Big Bounce , Multiverse or no complete end , False vacuum and Cosmic uncertainty
There are 3 possibilities for future of the universe:-
1.universe will go on expanding till gravity forces stops it.and then,under the action of gravity the universe will start contracting till it becomes as small as the point again(from where it started)
2.second possibility is that the universe will expand till it reaches a definite size at which point it will stop growing.(it is worthless to ask what lies beyond that)
3.the third possibility is that universe will go on increasing and become infinitely large