If you're afraid to, then you shouldn't. Simple.
What irritates the fukk out of me is people who go into relationships and get married full well knowing they've the propensity to cheat or fall victim to the temptation.
Always hear dudes talkin' about 'cuffin' a chick. ''She mine, she bad, don't no body fukk her'', while he out here running through a set of other hoes on some Harem, shyt.

And then want to catch feelings (and bodies

) when she gets fed up of you cheating or starts to creep with a simp or someone else who ain't treating her like meat. S'fukked up.
But yeah, the most you can do is be faithful yourself and trust that your partner is, while having the fortitude to move on if said partner was unfaithful. It's hard and it sorta feels like you're building castles of sand as opposed to a firm foundation in terms of just picking up and leaving if your partner cheats around on you, but I still maintain that you should never let anyone have complete control over your emotional and physical well being if you can help it. Treat 'em right with the hopes that they'd never fukk you over, and if they do just...............

You should only have unequivocal love for yourself and your seeds, 'brehs'.