Time travel is possible, but only into the future
Time --> (goes 1 second fast)
You --> (goes 1 second fast)
You, close enough to strong gravitational force --> (goes 0.5 seconds fast)
You get away from gravitational force. Time has gone 0.5 seconds faster then you. and you have time travelled double the amount of time you spend with the gravitational force into to the future
(the gravitational force needed is on par with like a blackhole)
Time is movement, it's how we measure it. Travelling to the past is not possible, as that requires all movement from where in time you want to go and where you are now, to reverse, except yours.
Also, uhm. Yeahhhh we dropped your boyfriend into the orbit of a blackhole, yeaahhh, he's in 3056 now, so sorry