How do you get over being cheated on?

[LeaveTheOceanBehind]

I am currently in a fantastic relationship with someone who is kind, smart, witty, and basically the living manifestation of the sun (if we're being cheesy today).

However, here's the thing: everyone I had seriously dated before this cheated on me. And in lieu with that, I'm finding myself withdrawing from my current relationship whenever things start feeling too comfortable because all I can think about is "cheating won't matter if you aren't invested in the first place". DP has never given me any reason to doubt her, and now I'm starting to fear that my dread of even the possibility of being cheated on is destroying everything bit by bit.

WWYD if you were me? How do I get over this mental block?

I don't think it's something you can just will to happen.
I'd say - you need to speak to someone, like a counsellor.

I don't know but I'm in a similar position. Don't currently have a DP but know I'm going to have difficulty fully investing and trusting after previous relationship horror.

The only advice I've seen that helped me was that you need to make a choice. And that choice is not letting the cheater change the person you want to be in a relationship.
You need to make an active choice to be the loving and trusting person you want to be and know you are, and no one gets to take that away.
If anyone cheats, that's their failure, not yours.
Easier said than done and I think something that would take a long time to get into the habit of, but I liked it.