Why do I still have doubts in my boyfriend?

Thank you for inviting me to be your friend. Oh, I'm sorry to hear that you'd been cheated by your boyfriend twice, if he cheated you twice there could be a greater possibility that he will do it again. But still, I don't have the right to judge your boyfriend. It's just my thought. Anyway, when it comes to marriage, you should take time and not hurry for doing such very important lifetime decision. Get to know him more, think a thousand times and balance everything, if you're ready and if he's the right guy for you. You know our feelings can be tricky, so be careful and don't forget to use your head. You need first to take all your doubts about his sincerity and love, you can't live someone whom you don't trust and if you do, your relationship will surely fall apart along the way. It might be good to take some time away from him and have a vacation, to clear up everything that bothers you. Or you can pray to God and ask Him guidance so He will give you light and so you can make a right decision. Anyway, I wish you all the best. I'm sure you'll come up the right decision. And thank you for sharing with us and enjoy your day!