Alex Summers / Havok

Main Comics (616)

 * 1) Lorna Dane / Polaris - Alex dated his X-Men teammate Lorna for some time.
 * 2) Alternate Madelyn Pryor - Alex had been infatuated with his brother Scott's wife Madelyn. When he found himself trapped in an alternate dimension for some time, he formed a relationship with that worl'ds Madelyn, before returning to our own.

After this point, Alex resumed his relationship with Lorna, and at one point the two became engaged.

Alternate Version

 * 1)  Janet Van Dyne / Wasp (616)  - Janet Van Dyne became trapped in an alternate universe, as Alex had once been, and formed a longstanding relationshp with that world's Alex Summers before returning to our own.