How long have you had them both?
Have they lived side by side for a while before you tried bonding?
How long were they in the bonding pen?
Negative signs like what?
Things like chasing, mounting, rumbling aren’t negative signs - that is normal dominance. However, that doesn’t mean to say a bond would still work. For example, those behaviours can slip over into bullying ans then they can’t e together.
Also, you are trying to bond a teenage boar (goose) right at the height of hormones at 6 months of age and at the hardest time to try to bond with another boar. Tito may also still be within this teens as well (they are teenagers until 14 months of age).
If Tito is being submissive but Goose still keeps pushing it, then that can either because they aren’t going to break compatible but sometimes a piggy who feels out of his depth (in this case Goose) can sometimes over compensate and become overly dominant.
For boars, bonding is a one time event - all or nothing seen through to conclusion whether it is success or failure. You can’t repeatedly stop a bonding and keep trying again because it’s frustrating to them to never have it seen through.
With that said, you could give them a few days to calm down and then one more time on neutral territory (somewhere neither of them see as their normal space).
You do need to be clear on the behaviours you are seeing though.
If it doesn’t work after one more try, depending hugely on what you are seeing as you haven’t given us much information on what is actually happening, then you may need to call it a day and accept that they cannot live in the same cage.
The guides that have been linked in explain everything about the behaviours you want to see during bonding
